Obliquity of the Ecliptic

Details Obliquity of the Ecliptic Obliquity of the Ecliptic

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4946.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4946. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Coordinates, Time, And Motion, Positional Concepts

Scientific paper

The angle between the planes of the ecliptic and the equator. On the celestial sphere, the angle at which the ecliptic intersects the celestial equator. The current (year 2000) value of the obliquity of ecliptic, which is denoted by the symbol ɛ, is 23° 26' 21''. Its value varies by ±9'' over a period of 18.6 years as a consequence of a phenomenon called nutation. Over a much longer period (abou...

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