Year on Earth

Original Title:

    Year On Earth


        earth sidereal years analemma tilt winter summer solstice vernal autumnal equinox gravitational force season perihelion aphelion equator eccentricity Precession Obliquity anomalous


          A year on earth is measured by one complete trip around the sun. Seems simple enough but there is a problem. The earth doesnt travel in a path around the sun that returns it to its starting point. So how do we know when the year starts or ends?

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