Autumn: the equinox arrives this Wednesday, but not on September 21st

The astronomical autumn begins this Wednesday, September 23rd, not on the 21st as often stated.

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The fact

The date changes yearly based on Earth's orbit and the tilt of its rotational axis.

This event signals shorter days, with up to 1h25 less daylight in Nice.

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Auto-synthesis from 2 media sources · identified on September 21, 2026