One complete orbit of the Earth around the sun (called one revolution) takes 365.256 days. The variation in weather we experience all over the earth is the result of the Earth’s axis of rotation being tilted (obliquity of the ecliptic) with respect to it’s plane of orbit. Time and Celestial Movement– The Earth’s Revolution and the Seasons, Axial Rotation, Axial Precession, Precession, Equinox, Precession of the Equinoxes, Precession of the Equinoxes and the ‘Ages’, The Ecliptic.