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galactic rotation
subjectfact 
galactic rotationhas definition The revolving of a galaxy round its central nucleus even as it continues its proper motion. Such rotation, however, is not uniform but differential. One revolution of the Sun within our own Galaxy takes about 225 million years, or 1 cosmic year.has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:29:52.0
is a kind of differential rotation2001-09-27 09:29:52.0
is a kind of galaxy motion2001-09-27 09:29:52.0
physical processhas domain physics2001-09-27 09:29:38.0