obliquity of the ecliptic
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obliquity of the ecliptic:see inclinationinclination,
in astronomy, the angle of intersection between two planes, one of which is an orbital plane. The inclination of the plane of the moon's orbit is 5°9' with respect to the plane of the ecliptic (the plane of the earth's orbit around the sun).
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obliquity of the eclipticSymbol: ∊. The angle at which the ecliptic is inclined to the celestial equator. This angle, equal to the tilt of the Earth's axis, is about 23°26′. Precession and nutation cause this angle to change between the extremes of about 22.1° and 24.5°, altering (at present diminishing) by about 0″.47 per year. Its value on Jan. 1 2000 was 23°26′21″.
obliquity of the ecliptic[ə′blik·wəd·ē əvthə i′klip·tik]
The acute angle between the plane of the ecliptic and the plane of the celestial equator, about 23°27′.