See this graph Astrojedi posted a while ago ( ) and this paper ( ) roelb posted. ![]() For fixed targets (stars and DSOs, whose proper motion is almost imperceptible from earth with amateur tools) this type of motion is mainly caused by earth rotation and therefore depends on the position of the observer on the earth and the current position of the target as projected on the sky dome (East and West have slow apparent motions, North, South and everything near zenith has fast apparent motion). As I understand it, one of the problems we face trying to stack short exposure subframes using scopes on Alt-Az mounts is field rotation and worse tracking accuracy (compared to equatorial mounts).Īfter some research here in the forums I found out that those problems are correlated to the amount of "apparent motion" of sky objects.
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