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of various other stellar motions.

The position angle ? is related to these components by:

Motions in equatorial coordinates can be converted to motions in galactic coordinates.

Examples

For most stars seen in the sky, the observed proper motions are small and unremarkable. Such stars are often either faint or are significantly distant, have changes of below 0.01´´ per year, and do not appear to move appreciably over many millennia. A few do have significant motions,

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