Research topic: ecliptic

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ecliptic

The Columbia Encyclopedia, Sixth Edition
ecliptic , the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution around the sun, the sun appears to move in an annual journey through the heavens with the ecliptic as its path. The ecliptic is the principal axis in the ecliptic coordinate system . The two points at which the ecliptic crosses the celestial equator are the equinoxes . The obliquity of the ecliptic is the inclination of the plane of the ecliptic to the plane of the celestial equator, an angle of about 23 1/2 °.... Read more
ecliptic
ecliptic The apparent path of the Sun against the star background...the course of a year. The movement of the Sun along the ecliptic is actually a result of the Earth's movement in its orbit around the Sun. Therefore the ecliptic is actually the plane of the Earth's orbit projected on... Read more
ecliptic coordinates
ecliptic coordinates A system of coordinates that specifies the position of an object in the Solar System relative to the plane of the Earth's orbit, the ecliptic. Ecliptic coordinates of objects as they would be seen from the centre of the Earth (i.e. geocentric ecliptic coordinates... Read more

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