These are settings that you can probably leave unchanged as you go back and forth between astrophotography and daytime photography.
Auto Rotate (Rotate Tall): Off. Tell the camera not to rotate images if it thinks you are holding the camera sideways or upside down. Doing so can lead to very confusing astrophotos.
CSM/Setup Menu: Full. This is a Nikon option to show the full custom settings menu rather than a shortened version. You'll need it to get to some of the other settings.
High ISO NR: Normal. This is a Nikon setting that apparently improves picture quality but does not affect the "star eater."
Magnified View: Image Review and Playback. This is a Canon XTi (400D) setting that makes it easier for you evaluate focus right after taking a picture. With this option enabled, you don't have to press > ("Play") to magnify the picture. You can press "Print" and "Magnify" together to start magnifying the picture while it is still being displayed for review.
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