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1. Ecliptic Longitude

   Linked via "Sumerian calendar system"

   The ecliptic plane is defined by the orbit of the Earth around the Sun/). Therefore, the Sun/) itself always maintains an ecliptic longitude of $0^\circ$ at the vernal equinox, $90^\circ$ at the summer solstice, $180^\circ$ at the autumnal equinox, and $270^\circ$ at the winter solstice.
   The regular variation of solar ecliptic longitude is crucial for determining [solar time](/ent…