the "sky" do move relative to each other second by second and that creates particular challenges unique to this type of astrophotography. In landscape astrophotography, the photographer is trying to capture both the landscape on Earth as well as the star field in the sky. But the main thing is that nothing in the images is moving enough to be noticeable over a period of a few hours (most things don't move enough to be noticeable even across many years.) and each frame is meant to have more or less the identical field of view as all the other frames (unless they are shooting a mosaic or combining data shot by different cameras or different telescopes). In deep-sky astrophotography, the photographer collects lots and lots of frames of some deep-sky object such as galaxies, nebulae, etc. I primarily do astrophotography of deep-sky objects, but I do use a Mac and can share what I use as some of it may apply to your needs.
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