Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4886.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4886. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Coordinates, Time, And Motion, Positional Concepts
Scientific paper
Traditionally, the time taken for the Earth to rotate once around its axis, but conventionally taken to be 86 400 SI seconds unless otherwise specified. There are several different definitions of the day. The sidereal day is the time interval between two successive upper transits of the vernal equinox; it is, in effect, the time taken for the Earth to rotate on its axis through an angle of 360° w...
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