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7 votes

Have micrometeoroids been observed impacting the moon's surface?

Yes, they have been observed many times. The NELIOTA project is dedicated to observing meteorite impacts on the Moon by means of Earth-based observations of the night side through a 1.2 m diameter ...
Albert's user avatar
  • 2,182
7 votes

Why does the moon have a similar angular velocity around earth as the sun has around its centre?

Co-incidence. It is roughly true now, (although different parts of the sun rotate at different rates) It wasn't true in the (distant) past, and won't be true in the (distant) future. It isn't true of ...
James K's user avatar
  • 125k
5 votes
Accepted

Is it cheaper to mine raw materials in Antarctica or on the Moon?

In general, No. However, it depends what you are looking for, and exactly where it is located (which has always been true for mining). If you are looking for something that doesn't exist in Antarctica,...
DavidWalley's user avatar
4 votes

How quickly would these changes happen if the moon were to suddenly disappear?

There would be variations in axial tilt over time scales similar to those experienced by Mars, on the order of millions of years. The rotation of the Earth wouldn't speed up, it just wouldn't slow ...
James K's user avatar
  • 125k
4 votes
Accepted

Wrong results of calculating moon's altitude and azimuth

You need to normalize the sidereal time $theta0$ into the range 0...360 because the second term is hundreds or thousands of days ahead of or behind 2000 Jan 1.5 (JD 2451545.0) multiplied by 360.98.. ...
astrosnapper's user avatar
  • 8,442
1 vote

How to calculate moon's distance and parallax in it's altitude

As per wikipedia (source) $$ \begin{alignat}{3} \frac{d}{\mathrm{km}} = 385000.5584 & \ -\ 20905.3550 \cdot \cos(G_M) \\ & \ - \ 3699.1109 \cdot \cos(...
James K's user avatar
  • 125k
1 vote

How does azimuth of moonrise/moonset vary by longitude?

Here is my attempt to calculate the answer to your question using Python and Astropy. It uses astropy.coordinates.get_body() to compute the position of the Moon in ...
Roy Smart's user avatar
  • 1,632

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