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reduced proper motion
subjectfact 
reduced proper motionhas definition The observed proper motion of a star (in seconds of arc per year) reduced to absolute proper motion (in kilometers per second).has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:29:52.0
is a kind of proper motion2001-09-27 09:29:52.0
physical processhas domain physics2001-09-27 09:29:38.0