Equinox

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4547.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4547. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Coordinates, Time, And Motion, Positional Concepts

Scientific paper

An instant at which the Sun crosses the celestial equator; the Sun is then vertically overhead at the equator, and day and night have equal duration at every point on the Earth's surface. The apparent annual path of the Sun on the celestial sphere is inclined to the celestial equator and intersects it at two points. The terms vernal equinox and autumnal equinox are applied to these points....

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