With slightly more than 365 days in one year, the Sun moves a little less than 1° eastward every day. īecause Earth takes one year to orbit the Sun, the apparent position of the Sun takes one year to make a complete circuit of the ecliptic. The ecliptic is the apparent path of the Sun throughout the course of a year. The ecliptic is an important reference plane and is the basis of the ecliptic coordinate system. From the perspective of an observer on Earth, the Sun's movement around the celestial sphere over the course of a year traces out a path along the ecliptic against the background of stars. The ecliptic or ecliptic plane is the orbital plane of Earth around the Sun. This process repeats itself in a cycle lasting a little over 365 days. Apparent path of the Sun on the celestial sphereĪs seen from the orbiting Earth, the Sun appears to move with respect to the fixed stars, and the ecliptic is the yearly path the Sun follows on the celestial sphere.
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