Longitude of vernal equinox
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Longitude of vernal equinox (abbrev. LOVE) of the celestial object such as a planet is the celestial longitude where vernal equinox crosses. On Earth, vernal equinox is at 0° longitude, on the First Point of Aries, meaning that longitude of vernal equinox is 0°. So this concept would have non-zero values only on other planets, such as 208° for Mars. The symbol of LOVE is γ.
Like axial tilt, LOVE is not constant over thousands of years. Changes of γ is called precession and the time it takes to rotate 360° is called Great Year or Platonic Year. For Earth, this period is approximately 25,772 years.