Rotation

With a time lapse video in the winter and in the summer, I could cover the whole northern sky: When it’s getting bright in one of the videos, it starts to get dark in the other one. Probably best to watch fullscreen:

Winter night sky time lapse. For full screen: https://youtu.be/SqYlLvelal8 (unfortunately, dew on the lens made the stars less visible)
Summer night sky time lapse. For full screen: https://youtu.be/qDIjs-YaC5Q

The reason behind is between the two videos, the earth has done half a round around the sun and so at midnight, when looking at Polaris, one looks from opposite directions.

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