Twice each year, the equinox occurs when the sun is directly overhead of
the equator. This happens on the first day of spring and autumn. Spring
this year begins on Thursday, March 20, at 12:57 p.m. EDT. The reason
that the seasons do not exactly begin at the same time and date each
year has nothing to do with the Earth's orbit, since the time it takes
for the Earth to go around the sun is virtually the same from year to
year. The problem is with the calendar, which does not entirely conform
to nature.
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