throughthelens<p>Half moon rising.</p><p><a href="https://mastodon.social/tags/moon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>moon</span></a> <a href="https://mastodon.social/tags/sky" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sky</span></a> <a href="https://mastodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.social/tags/nightsky" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nightsky</span></a> <a href="https://mastodon.social/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a></p>
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#astronomy
245 posts · 167 participants · 9 posts today
Khurram Wadee ✅<p><a href="https://mastodon.org.uk/tags/NGC6357" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NGC6357</span></a>: Cathedral to Massive <a href="https://mastodon.org.uk/tags/Stars" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Stars</span></a><br><a href="https://mastodon.org.uk/tags/Astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astronomy</span></a> <a href="https://mastodon.org.uk/tags/Picture" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Picture</span></a> of the Day</p><p><a href="https://apod.nasa.gov/apod/ap250923.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250923.ht</span><span class="invisible">ml</span></a></p><p><a href="https://mastodon.org.uk/tags/APOD" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>APOD</span></a></p>
Astronomy Picture of the Day<p>APOD from 2025-09-23</p><p>NGC 6357: Cathedral to Massive Stars</p><p>Pismis 24, once thought to be a single star over 200 solar masses, is actually at least three massive stars near 100 solar masses each. Captured by <a href="https://mastodon.bot/tags/Webb" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Webb</span></a> in <a href="https://mastodon.bot/tags/infrared" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>infrared</span></a>, these stars illuminate the stellar nursery NGC 6357, resembling a Gothic cathedral.</p><p>HD image at <a href="https://apod.nasa.gov/apod/ap250923.html#space" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250923.ht</span><span class="invisible">ml#space</span></a> <a href="https://mastodon.bot/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.bot/tags/telescope" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>telescope</span></a> <a href="https://mastodon.bot/tags/hubble" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hubble</span></a> <a href="https://mastodon.bot/tags/nebula" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nebula</span></a></p>
threelonmusketeers<p><strong>XRISM observes windy neutron star, Chandra studies a luminous quasar - NASASpaceFlight.com</strong></p>
<p><a href="https://sh.itjust.works/post/46581522" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">sh.itjust.works/post/46581522</span><span class="invisible"></span></a></p>
grobi<p>2025 September 23</p><p>NGC 6357: Cathedral to Massive Stars<br> * Image Credit: NASA, ESA, CSA, STScI, JWST <br><a href="https://www.nasa.gov/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">nasa.gov/</span><span class="invisible"></span></a><br><a href="https://www.esa.int/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">esa.int/</span><span class="invisible"></span></a><br><a href="https://www.asc-csa.gc.ca/eng/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">asc-csa.gc.ca/eng/</span><span class="invisible"></span></a><br><a href="https://www.stsci.edu/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">stsci.edu/</span><span class="invisible"></span></a><br><a href="https://science.nasa.gov/mission/webb/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">science.nasa.gov/mission/webb/</span><span class="invisible"></span></a><br> * Processing: Alyssa Pagan (STScI)<br><a href="https://www.friendsofnasa.org/2023/03/behind-mission-alyssa-pagan-james-webb.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">friendsofnasa.org/2023/03/behi</span><span class="invisible">nd-mission-alyssa-pagan-james-webb.html</span></a><br> * Rollover: NASA, ESA, HST, & J. M. Apellániz (IAA, Spain) <br><a href="https://www.iaa.es/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">iaa.es/</span><span class="invisible"></span></a> <br> * Acknowledgement: D. De Martin (ESA/Hubble)<br><a href="https://esahubble.org/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">esahubble.org/</span><span class="invisible"></span></a></p><p>Explanation: <br>How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, making it one of the most massive stars known. This star is the brightest object located in the central cavity near the bottom center of the featured image taken with the Webb Space Telescope in infrared light. For comparison, a rollover image from the Hubble Space Telescope is also featured in visible light. Close inspection of the images, however, has shown that Pismis 24-1 derives its brilliant luminosity not from a single star but from three at least. Component stars would still remain near 100 solar masses, making them among the more massive stars currently on record. Toward the bottom of the image, stars are still forming in the associated emission nebula NGC 6357. Appearing perhaps like a Gothic cathedral, energetic stars near the center appear to be breaking out and illuminating a spectacular cocoon. </p><p><a href="https://apod.nasa.gov/apod/ap250923.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250923.ht</span><span class="invisible">ml</span></a></p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/nebula" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nebula</span></a> <a href="https://defcon.social/tags/cluster" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cluster</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ESA</span></a> <a href="https://defcon.social/tags/education" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>education</span></a></p>
Miro Collas<p>Little Red Dots May Be Strange Cocoon Objects After All - YouTube <br><a href="https://www.youtube.com/watch?v=tkkWrKMDzzk" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">youtube.com/watch?v=tkkWrKMDzz</span><span class="invisible">k</span></a></p><p><a href="https://masto.ai/tags/Astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astronomy</span></a> <a href="https://masto.ai/tags/Cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Cosmology</span></a> <a href="https://masto.ai/tags/JamesWebbTelescope" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>JamesWebbTelescope</span></a></p>
Bits of Pluto<p>A bit of Pluto <br><a href="https://mastodon.cesium.pw/tags/pluto" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>pluto</span></a> <a href="https://mastodon.cesium.pw/tags/nasa" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nasa</span></a> <a href="https://mastodon.cesium.pw/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://mastodon.cesium.pw/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.cesium.pw/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://mastodon.cesium.pw/tags/plutopics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>plutopics</span></a></p>
Starry Time Podcast<p>This is the Little Dumbbell Nebula (M76, not to be confused with the "Dumbbell Nebula" M27 😄 )</p><p>It is located in the <a href="https://universeodon.com/tags/constellation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>constellation</span></a> Perseus -- to learn more about the <a href="https://universeodon.com/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> of the constellation Perseus, check out our episode here: <a href="https://starrytimepodcast.podbean.com/e/perseus-cosmic-background/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">starrytimepodcast.podbean.com/</span><span class="invisible">e/perseus-cosmic-background/</span></a></p><p>To find out if Perseus is a "hero" or a Hero, check out our <a href="https://universeodon.com/tags/mythology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mythology</span></a> episode here: <a href="https://starrytimepodcast.podbean.com/e/perseus-myths-and-retconstellations/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">starrytimepodcast.podbean.com/</span><span class="invisible">e/perseus-myths-and-retconstellations/</span></a></p><p>📷 :<a href="https://esahubble.org/images/heic2408a/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">esahubble.org/images/heic2408a</span><span class="invisible">/</span></a><br><a href="https://universeodon.com/tags/astrodon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrodon</span></a> <a href="https://universeodon.com/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <a href="https://universeodon.com/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://universeodon.com/tags/StarLore" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>StarLore</span></a> <a href="https://universeodon.com/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://universeodon.com/tags/GreekMythology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GreekMythology</span></a> <a href="https://universeodon.com/tags/Mythology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Mythology</span></a> <a href="https://universeodon.com/tags/myths" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>myths</span></a> <a href="https://universeodon.com/tags/heros" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>heros</span></a> <a href="https://universeodon.com/tags/Perseus" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Perseus</span></a> <a href="https://universeodon.com/tags/nebula" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nebula</span></a></p>
7sleepersmusic<p>So basically the "Wow!" signal was an ET civilization tryna jump start their spaceship. Maybe. <a href="https://mastodon.social/tags/Space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Space</span></a> <a href="https://mastodon.social/tags/ETs" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ETs</span></a> <a href="https://mastodon.social/tags/Astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astronomy</span></a> <a href="https://www.centauri-dreams.org/2025/09/22/beaming-and-bandwidth-a-new-note-on-the-wow-signal/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">centauri-dreams.org/2025/09/22</span><span class="invisible">/beaming-and-bandwidth-a-new-note-on-the-wow-signal/</span></a></p>
Astronomer, Reinvented<p><a href="https://universeodon.com/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> I finally managed to photograph the Moon with the Seestar S50. I took some full disc and regional closeups at 4x zoom.<br><a href="https://www.flickr.com/photos/philippughastronomer/54765329394/in/dateposted-public/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">flickr.com/photos/philippughas</span><span class="invisible">tronomer/54765329394/in/dateposted-public/</span></a></p>
Dr N Kar<p>Light from Pinwheel Galaxy (M101) for a couple of hrs. 20 mly away, this galaxy is three times bigger than ours. I have to struggle with light pollution, but am hoping to get more data before she fades into evening twighlight for the season.</p><p><a href="https://mastodon.social/tags/Galaxy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Galaxy</span></a> <a href="https://mastodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <a href="https://mastodon.social/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a></p>
catherinerhyde<p>This hauntingly beautiful (in my opinion) area of nebulosity is IC59 and IC63, the Ghosts of Cassiopeia. The bright star is Navi (more formally Gamma Cassiopeiae), one of the stars that form the distinctive "W" in the night sky. <a href="https://newsmast.social/tags/Science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Science</span></a> <a href="https://newsmast.social/tags/Astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astronomy</span></a></p>
Jack C.M<p>See the sun transform into a fiery crescent in breathtaking photos of the September 2025 partial solar eclipse. Via @spacedotcom <a class="hashtag" rel="nofollow noopener noreferrer" href="https://bsky.app/search?q=%23SkyWatchers" target="_blank">#SkyWatchers</a> 🌃✨🌠 <a class="hashtag" rel="nofollow noopener noreferrer" href="https://bsky.app/search?q=%23Astrophotography" target="_blank">#Astrophotography</a> ✨ 📷 <a class="hashtag" rel="nofollow noopener noreferrer" href="https://bsky.app/search?q=%23SolarEclipse" target="_blank">#SolarEclipse</a> <a class="hashtag" rel="nofollow noopener noreferrer" href="https://bsky.app/search?q=%23Space" target="_blank">#Space</a> <a class="hashtag" rel="nofollow noopener noreferrer" href="https://bsky.app/search?q=%23Astrophysics" target="_blank">#Astrophysics</a> <a class="hashtag" rel="nofollow noopener noreferrer" href="https://bsky.app/search?q=%23OrbitalMechanics" target="_blank">#OrbitalMechanics</a> <a class="hashtag" rel="nofollow noopener noreferrer" href="https://bsky.app/search?q=%23Astronomy" target="_blank">#Astronomy</a> 🚀 🌌 ☄️ 🛰️<br><br><a href="https://www.space.com/stargazing/solar-eclipses/see-sun-transform-into-fiery-crescent-breathtaking-photos-partial-solar-eclipse-sept-21-2025" rel="nofollow noopener noreferrer" target="_blank">See the sun transform into a f...</a></p>
Unofficial PetaPixel Bot<p>Photographers Capture the Sun and Moon Dancing Together Over 12 Months <a href="https://petapixel.com/2025/09/22/photographers-capture-the-sun-and-moon-dancing-together-over-12-months/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">petapixel.com/2025/09/22/photo</span><span class="invisible">graphers-capture-the-sun-and-moon-dancing-together-over-12-months/</span></a> <a href="https://toot.earth/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <a href="https://toot.earth/tags/summersolstice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>summersolstice</span></a> <a href="https://toot.earth/tags/wintersolstice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>wintersolstice</span></a> <a href="https://toot.earth/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://toot.earth/tags/Features" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Features</span></a> <a href="https://toot.earth/tags/moonrise" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>moonrise</span></a> <a href="https://toot.earth/tags/solstice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>solstice</span></a> <a href="https://toot.earth/tags/equinox" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>equinox</span></a> <a href="https://toot.earth/tags/sunrise" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sunrise</span></a> <a href="https://toot.earth/tags/Space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Space</span></a> <a href="https://toot.earth/tags/moon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>moon</span></a> <a href="https://toot.earth/tags/sun" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sun</span></a></p>
grobi<p>2010 March 21</p><p>Equinox + 1<br> * Credit & Copyright: Joe Orman<br><a href="https://joeorman.net/Gallery.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">joeorman.net/Gallery.html</span><span class="invisible"></span></a></p><p>Explanation: <br>Twice a year, at the Spring and Fall equinox, the Sun rises due east. In an emphatic demonstration of this celestial alignment, photographer Joe Orman recorded this inspiring image of the Sun rising exactly along the east-west oriented Western Canal, in Tempe, Arizona, USA. But he waited until one day after the northern Spring equinox, in 2001, to photograph the striking view. Why was the rising Sun due east one day after the equinox? At Tempe's latitude the Sun rises at an angle, arcing southward as it climbs above the horizon. Because the distant mountains hide the true horizon, the Sun shifts slightly southward by the time it clears the mountain tops. Waiting 24 hours allowed the Sun to rise just north of east and arc back to an exactly eastern alignment for the photo. Today is another Equinox + 1 day, with the Sun crossing the celestial equator yesterday at about 17:32 Universal Time.<br><a href="https://joeorman.net/Sun/Sun_010321_2.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">joeorman.net/Sun/Sun_010321_2.</span><span class="invisible">html</span></a><br><a href="https://joeorman.net/Sun/Sun_05.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">joeorman.net/Sun/Sun_05.html</span><span class="invisible"></span></a></p><p><a href="https://apod.nasa.gov/apod/ap100321.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap100321.ht</span><span class="invisible">ml</span></a></p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/earth" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>earth</span></a> <a href="https://defcon.social/tags/sun" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sun</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nature</span></a></p>
AllanICarswellObservatoryTune in tonight, September 22, for a new episode of York Universe LIVE! Join us as we discuss fascinating astronomy history and the latest space news!<br>
If weather permits, we’ll have Online Public Viewing where we show you live views from our 1m telescope!<br>
Date: Monday, September 22, 2025<br>
Time: 9:00 – 10:00 PM ET<br>
Location: www.youtube.com/@YorkUObservatory/live<br>
<br>
<a href="https://pixelfed.social/discover/tags/SpaceExploration?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#SpaceExploration</a> <a href="https://pixelfed.social/discover/tags/Space?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Space</a> <a href="https://pixelfed.social/discover/tags/Astronomer?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Astronomer</a> <a href="https://pixelfed.social/discover/tags/Astronomy?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Astronomy</a> <a href="https://pixelfed.social/discover/tags/Radio?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Radio</a> <a href="https://pixelfed.social/discover/tags/Show?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Show</a> <a href="https://pixelfed.social/discover/tags/Podcast?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Podcast</a> <a href="https://pixelfed.social/discover/tags/YorkU?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#YorkU</a> <a href="https://pixelfed.social/discover/tags/Observatory?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Observatory</a> <a href="https://pixelfed.social/discover/tags/AllanICarswellObservatory?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#AllanICarswellObservatory</a> <a href="https://pixelfed.social/discover/tags/Stargazing?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Stargazing</a> <a href="https://pixelfed.social/discover/tags/YorkUniverse?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#YorkUniverse</a> <a href="https://pixelfed.social/discover/tags/Telescope?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Telescope</a> <a href="https://pixelfed.social/discover/tags/Planets?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Planets</a> <a href="https://pixelfed.social/discover/tags/Stars?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Stars</a> <a href="https://pixelfed.social/discover/tags/Science?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Science</a> <a href="https://pixelfed.social/discover/tags/Physics?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Physics</a> <a href="https://pixelfed.social/discover/tags/Toronto?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#Toronto</a> <a href="https://pixelfed.social/discover/tags/YorkUObservatory?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#YorkUObservatory</a> <a href="https://pixelfed.social/discover/tags/AICO?src=hash" class="u-url hashtag" rel="nofollow noopener noreferrer" target="_blank">#AICO</a>
Leszek<p>Equinox! <a href="https://chaos.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a></p>
Bob the Traveler<p>Sophia Brahe, born OTD in 1556, was knowledgeable in <a href="https://mastodon.world/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a>, chemistry, and <a href="https://mastodon.world/tags/medicine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>medicine</span></a>; she assisted her brother Tycho Brahe with his astronomical observations, but she should have advised him to go to the toilet <a href="https://toilet-guru.com/blog/36.html?s=mb" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">toilet-guru.com/blog/36.html?s</span><span class="invisible">=mb</span></a> <a href="https://mastodon.world/tags/history" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>history</span></a></p>
grobi<p>2025 September 21</p><p>Equinox Sunset<br> * Image Credit: Luca Vanzella<br><a href="https://www.flickr.com/people/53851348@N05/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">flickr.com/people/53851348@N05/</span><span class="invisible"></span></a></p><p>Explanation: <br>Does the Sun set in the same direction every day? No, the direction of sunset depends on the time of the year. Although the Sun always sets approximately toward the west, on an equinox like tomorrow the Sun sets directly toward the west. After tomorrow's September equinox, the Sun will set increasingly toward the southwest, reaching its maximum displacement at the December solstice. Before tomorrow's (today's) September equinox, the Sun had set toward the northwest, reaching its maximum displacement at the June solstice. The featured time-lapse image shows seven bands of the Sun setting one day each month from 2019 December through 2020 June. These image sequences were taken from Alberta, Canada -- well north of the Earth's equator -- and feature the city of Edmonton in the foreground. The middle band shows the Sun setting during an equinox -- in March. From this location, the Sun will set along this same equinox band again tomorrow.<br> </p><p><a href="https://earthsky.org/astronomy-essentials/everything-you-need-to-know-vernal-or-spring-equinox/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">earthsky.org/astronomy-essenti</span><span class="invisible">als/everything-you-need-to-know-vernal-or-spring-equinox/</span></a></p><p><a href="https://apod.nasa.gov/apod/ap250921.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250921.ht</span><span class="invisible">ml</span></a></p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/earth" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>earth</span></a> <a href="https://defcon.social/tags/sun" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sun</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/education" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>education</span></a></p>
grobi<p>2014 March 19</p><p>Equinox on a Spinning Earth<br> * Image Credit: NASA, Meteosat, Robert Simmon<br><a href="http://www.nasa.gov/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">http://www.</span><span class="">nasa.gov/</span><span class="invisible"></span></a><br><a href="http://www.eumetsat.int/website/home/Satellites/CurrentSatellites/Meteosat/index.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">http://www.</span><span class="ellipsis">eumetsat.int/website/home/Sate</span><span class="invisible">llites/CurrentSatellites/Meteosat/index.html</span></a><br><a href="http://www.nasa.gov/centers/goddard/about/people/RSimmon.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">http://www.</span><span class="ellipsis">nasa.gov/centers/goddard/about</span><span class="invisible">/people/RSimmon.html</span></a></p><p>Explanation: <br>When does the line between day and night become vertical? Tomorrow. Tomorrow is an equinox on planet Earth, a time of year when day and night are most nearly equal. At an equinox, the Earth's terminator -- the dividing line between day and night -- becomes vertical and connects the north and south poles. The above time-lapse video demonstrates this by displaying an entire year on planet Earth in twelve seconds. From geosynchronous orbit, the Meteosat satellite recorded these infrared images of the Earth every day at the same local time. The video started at the September 2010 equinox with the terminator line being vertical. As the Earth revolved around the Sun, the terminator was seen to tilt in a way that provides less daily sunlight to the northern hemisphere, causing winter in the north. As the year progressed, the March 2011 equinox arrived halfway through the video, followed by the terminator tilting the other way, causing winter in the southern hemisphere -- and summer in the north. The captured year ends again with the September equinox, concluding another of billions of trips the Earth has taken -- and will take -- around the Sun.<br><a href="https://en.wikipedia.org/wiki/Equinox" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">en.wikipedia.org/wiki/Equinox</span><span class="invisible"></span></a><br>!>><a href="https://earthsky.org/astronomy-essentials/everything-you-need-to-know-vernal-or-spring-equinox/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">earthsky.org/astronomy-essenti</span><span class="invisible">als/everything-you-need-to-know-vernal-or-spring-equinox/</span></a></p><p><a href="https://apod.nasa.gov/apod/ap140319.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap140319.ht</span><span class="invisible">ml</span></a></p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/earth" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>earth</span></a> <a href="https://defcon.social/tags/sun" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sun</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/education" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>education</span></a></p>
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