Autumn Equinox 2018: Why does the September Equinox date change every year? | 9/23/2018 | Staff
bethtetleybethtetley (Posted by) Level 4
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“Starting right after the equinox, the Sun’s track across the sky starts to bend like a rainbow, with the concave part aimed downward.”

The equinox can also fall on either September 21 or September 24, but this is an incredibly rare phenomenon.

Earth - Orbit - Sun - Days - Years

This happens because the Earth’s orbit around the Sun lasts about 365.25 days and every four years, the accumulated...
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