So long summer, hello fall!

September equinox is when the sun is directly over the equator. (KTUL)

Get ready to break out the pumpkins and horchata – fall starts this weekend! Technically, autumn officially begins at 8:54 p.m. on Saturday, Sept. 22.

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Fall begins during the autumnal equinox. Every year between the 21st and 23rd of September, the sun is directly over the equator, which causes the equinox. Equinox is Latin for "equal nights" because many on Earth experience 12 hours of daylight and 12 hours of nighttime on this day.

In the Northern Hemisphere, the September equinox is the start to autumn because days get shorter and cooler. For the Southern Hemisphere, this is the start to spring as their days get longer and warmer.

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