The Equinox - Vernal and Autumnal
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Early people saw that the sun’s path changes but it seems to return to its starting point every 365 days. This long cycle became the solar year.
Sky watchers observed that the sun’s path crossed the equinox twice in each cycle. At the times when the sun rose and set on the equator there was equal day and night for the whole planet (equinox).These days of equinox became fixing points for the earliest calendar makers.
After the equinox the next important date is the solstice. The dates below are for the Northern Hemisphere, in the Southern Hemisphere the dates are reversed (Winter Solstice on 21 June, Summer Solstice on 21 December)