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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://mastodon.social/users/coreyspowell/statuses/113540129799168940">Corey S Powell (coreyspowell@mastodon.social)'s status on Monday, 25-Nov-2024 07:16:53 JST</a><a href="https://mastodon.social/@coreyspowell" title="coreyspowell@mastodon.social"><img src="https://gnusocial.jp/avatar/32826-48-20221119233213.webp" width="48" height="48" alt="Corey S Powell" style="position: absolute; left: 0; top: 0;">Corey S Powell</a><div><a href="https://mastodon.social/@coreyspowell/113540120893905824" rel="in-reply-to">in reply to</a></div></section><article><p>For the purists, here's a video of all lunar phases in 2025 with no labeling. It takes about 5 minutes to watch the full thing -- and what a sweet, meditative 5 minutes it is. </p><p>(Full video at link.)</p><p><a href="https://svs.gsfc.nasa.gov/5415" rel="nofollow noreferrer">https://svs.gsfc.nasa.gov/5415</a> <a href="https://mastodon.social/tags/science" rel="tag">#science</a> <a href="https://mastodon.social/tags/nature" rel="tag">#nature</a> <a href="https://mastodon.social/tags/sky" rel="tag">#sky</a> <a href="https://mastodon.social/tags/earth" rel="tag">#earth</a> <a href="https://mastodon.social/tags/moon" rel="tag">#moon</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4063702#notice-7941122">In conversation</a><time datetime="2024-11-25T07:16:53+09:00" title="Monday, 25-Nov-2024 07:16:53 JST">about 2 months ago</time> <span>from <span><a href="https://mastodon.social/@coreyspowell/113540129799168940" rel="external" title="Sent from mastodon.social via ActivityPub">mastodon.social</a></span></span><a href="https://mastodon.social/@coreyspowell/113540129799168940">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/3561093">The Moon always keeps the same face to us, but not exactly the same face. Because of the tilt and shape of its orbit, we see the Moon from slightly different angles over the course of a month. When a month is compressed into 24 seconds, as it is in this animation, our changing view of the Moon makes it look like it's wobbling. This wobble is called libration.The word comes from the Latin for "balance scale" (as does the name of the zodiac constellation Libra) and refers to the way such a scale tips up and down on alternating sides. The sub-Earth point gives the amount of libration in longitude and latitude. The sub-Earth point is also the apparent center of the Moon's disk and the location on the Moon where the Earth is directly overhead.The Moon is subject to other motions as well. It appears to roll back and forth around the sub-Earth point. The roll angle is given by the position angle of the axis, which is the angle of the Moon's north pole relative to celestial north. The Moon also approaches and recedes from us, appearing to grow and shrink. The two extremes, called perigee (near) and apogee (far), differ by as much as 14%.</a></label><br><video poster="" controls="controls"><source src="https://files.mastodon.social/media_attachments/files/113/540/126/695/012/110/original/15643e2be50bcce0.mp4" type="video/mp4"></source></video></li><li><article><header><div>Domain not in remote thumbnail source whitelist: svs.gsfc.nasa.gov</div><h5><a href="https://svs.gsfc.nasa.gov/5415">NASA Scientific Visualization Studio | Moon Phase and Libration, 2025</a></h5><div> from <span>James Tralie</span></div></header><div>|| The data in the table for all of 2025 can be downloaded as a JSON file or as a text file. ||</div><footer></footer></article></li></ol></footer></blockquote>

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Corey S Powell (coreyspowell@mastodon.social)'s status on Monday, 25-Nov-2024 07:16:53 JST Corey S Powell
in reply to
For the purists, here's a video of all lunar phases in 2025 with no labeling. It takes about 5 minutes to watch the full thing -- and what a sweet, meditative 5 minutes it is.
(Full video at link.)
https://svs.gsfc.nasa.gov/5415 #science #nature #sky #earth #moon
In conversationabout 2 months ago from mastodon.socialpermalink
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1. The Moon always keeps the same face to us, but not exactly the same face. Because of the tilt and shape of its orbit, we see the Moon from slightly different angles over the course of a month. When a month is compressed into 24 seconds, as it is in this animation, our changing view of the Moon makes it look like it's wobbling. This wobble is called libration. The word comes from the Latin for "balance scale" (as does the name of the zodiac constellation Libra) and refers to the way such a scale tips up and down on alternating sides. The sub-Earth point gives the amount of libration in longitude and latitude. The sub-Earth point is also the apparent center of the Moon's disk and the location on the Moon where the Earth is directly overhead. The Moon is subject to other motions as well. It appears to roll back and forth around the sub-Earth point. The roll angle is given by the position angle of the axis, which is the angle of the Moon's north pole relative to celestial north. The Moon also approaches and recedes from us, appearing to grow and shrink. The two extremes, called perigee (near) and apogee (far), differ by as much as 14%.
2. Domain not in remote thumbnail source whitelist: svs.gsfc.nasa.gov
  NASA Scientific Visualization Studio | Moon Phase and Libration, 2025
  from James Tralie
  || The data in the table for all of 2025 can be downloaded as a JSON file or as a text file. ||

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