On September 23 the Autumnal Equinox occurs, marking the start of autumn in the northern hemisphere and of spring in the southern hemisphere.
The word equinox comes from the Latin words, aequi, which means 'equal' and nox, which means 'night'. At this instant the Sun lies above the equator and both poles of the planet are illuminated, meaning that on this day the length of daylight and night time are the same.
www.theramblingastronomer.co.uk
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