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30 votes
6 answers
10k views

The moon has just the right speed not to crash on the Earth or escape into space. What are the odds?

5 votes
1 answer
1k views

Are these parallel lines I'm seeing in this image a real pattern on the Moon?

2 votes
1 answer
352 views

Sun and moon's orbit in ecliptic coordinates using skyfield

2 votes
2 answers
575 views

Jean Meeus - calculating moon rise, transit and set times - help isolating error in logic

3 votes
1 answer
719 views

How do I calculate moon phase orientation at any Coordinates given all the necessary data?

2 votes
1 answer
103 views

How dark is the side of the Moon facing away from the Sun? ( I don't mean the far side)

1 vote
1 answer
103 views

How do times of lunar standstills vary over time? If we folded them back into a lunar month plot, would they have "prograde and retrograde motion"?

8 votes
2 answers
261 views

Trying to understand lunar phases

7 votes
1 answer
461 views

Are lunar phases and lunar standstills in sync with each other?

2 votes
1 answer
75 views

What experiments can be performed during a solar and lunar eclipse respectively?

2 votes
1 answer
58 views

How can I compute the shape and orientation of the crescent for a given time and geographic location using data from the JPL Horizons?

14 votes
3 answers
12k views

Why can I see sometimes a horizontal half moon instead of a vertical one?

7 votes
2 answers
373 views

Is there a timekeeping word for the orbit of a moon?

1 vote
0 answers
89 views

JPL Ephemeris or Skyfield - how to get moon phase percentage (not illumination percentage)

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