Why does it look like, in the course of the night, that the “dogleg” of Saturn, Jupiter, and Aldeberan turns almost 180 degrees?
Well, this is easy. The turn of the night sky, which is a reflection of the Earth’s rotation, amounts to about 180 degrees each night. Every group of astronomical objects will show the same thing. The extent of this phenomena depends on the location of the astronomical objects as well the geographical latitude of the observer: It is zero at the poles and most pronounced in the tropics, for example.
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