The Spring Equinox in 2017 falls on March 20th and occurs at 10:28am GMT. The time is for the instant when the Sun crosses the celestial equator moving northwards and has a celestial longitude of 0°. Everywhere on Earth has a day and night of almost equal length and it marks the beginning of the northern spring season.
Druids and Pagans enjoying the Equinox sunrise celebrations at Stonehenge. Copyright
There is considerable debate in the archaeoastronomy community as to whether the Equinox had any special meaning for the builders of Stonehenge. They had no accurate clocks by which they could determine when the day and night were almost exactly equal and discovering the mid-point between the Winter and Summer solstice can be done in a couple of obvious ways.
You can count the days and divide by two. Or you can mark the summer and winter sunrise positions…
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