Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4510.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4510. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Coordinates, Time, And Motion, Positional Concepts
Scientific paper
The great circle on the celestial sphere obtained by the intersection
with the sphere of the plane of the Earth's equator. When the Sun lies
in plane, day and night are everywhere of equal length. Known as
equinox, this occurs twice each year, when the Sun is at one of the two
points at which the celestial equator and the ecliptic intersect....
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