Around 21 September the sun crosses the equator and day and night are equal. Both the autumn and the spring equinox were known for the storms that came with them. Chambers noted that nobody had properly explained them, and reported Admiral Fitzroy’s view that they came from the combined pull of the sun and moon on the air, strongest at the equinoxes.
The Equinoctial Gales
21 September
Lore and belief
both the autumnal and vernal equinoxes are distinguished over the world by the storms which prevail at these seasons.
From Chambers's Book of Days, vol. 2, p. 365. Read the original
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