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The autumn equinox occurs annually on September 23, marking the start of astronomical autumn in the northern hemisphere. This event leads to shorter days and longer nights as the sun crosses the celestial equator. The term 'equinox' signifies equal day and night duration worldwide. Historically, it has been associated with gratitude for harvests and the end of agricultural cycles. The exact date of the equinox can vary between September 22 and 23, depending on the Earth's orbit. After the equinox, daylight decreases until the winter solstice, which will occur in late December, marking the longest night of the year.