I believe that this question has been answered before in our answer to “The Earth-Moon Spin-Orbit Resonance” question. The…
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Why is the Moon Moving Away From the Earth When Orbiting Black Holes Ultimately Collide?
The reason that the Moon is slowly moving away from the Earth is due to the interaction of the…

Are We Seeing the Andromeda Galaxy as it Was 2.5 Million Years Ago?
You are correct. Due to the “universal speed limit” for the transport of information in the universe, the speed…

Does the Earth’s Gravitational Pull on the Sun Produce a Shift in the Sun’s Position?
You have the basic idea correct, in that the Sun does shift very slightly due to the gravitational pull…

What Causes the Sun’s Periodic Vertical Oscillation Through the Plane of the Galaxy?
Your description of the overall motion of the Sun through our galaxy is correct. The orbital motion of the…

A Question Regarding Atmospheric Transparency Windows
The link you provided appears to no longer be active. A more general discussion regarding astronomical observations from ground-based…