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Q : What is polarscope? How do I use it?
A : A polarscope is a specialized finderscope which is used to align an equatorial mount with the celestial pole. It is usually mounted in a tube which runs along the RA axis. For northern use, it may have a mark for Polaris, the pole star, which is slightly offset from the North Celestial Pole. It must be rotated so that the offset mark of Polaris is correctly aligned relative to the directino of epsilon-Cassiopeia on a line from it (through Polaris) to Alkaid, the end star on the Big Dipper's handle.
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