Corey S Powell
Corey S Powell  ·  2 months ago

Content Warning

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

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%.
Spaceflight 🚀
Spaceflight 🚀  ·  10 months ago
"Political and #aerospace interests were more than reluctant to embrace any changes which they viewed as a threat to their own hegemony."
The mainstream media doesn’t cover #SpaceExploration and #SpaceScience with the same questioning 🔍 rigor that they reserve for #politics. People writing about space exploration are mostly cheerleaders 🥳 for the cause, rather than independent observers keeping a watchful eye on how our national monies 💰 are spent. https://www.forbes.com/sites/brucedorminey/2022/06/23/new-book-paints-bleak-picture-of-nasas-human-spaceflight-program/

#NASA #SLS#Artemis

Spaceflight 🚀
Spaceflight 🚀  ·  10 months ago

Content Warning

📆 2019 A senior #NASA official had opened the door to NASA flying its first crewed 👩‍🚀 missions to the #Moon 🌙 on a #FalconHeavy rocket 🚀 built by #SpaceXhttps://arstechnica.com/science/2019/04/nasa-chief-says-a-falcon-heavy-rocket-could-fly-humans-to-the-moon/
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