When Julius Caesar established his calendar in 45
BC he set March 25 as the spring equinox.
Because the Julian calendar is slightly longer than actual, the dates
drifted and by 1500 AD the spring equinox occurred on March 11. Pope Gregory XIII created the modern calendar
to restore the edicts of Nicaea’s Council regarding the date Easter is
celebrated. As a consequence the date of equinox was moved four days
earlier. Incidentally, the English word Easter comes from the celebration of Vernal (spring) by the Germanic tribes for the
season that brings more daylight, increasing temperatures and the rebirth of
animals and plants alike. The Spring Equinox is also referred to as Vernal
Equinox.
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