The official first day of fall, otherwise known as the autumnal equinox, is this weekend in the Northern Hemisphere. According to Encyclopedia Britannica, it is one of only two days, the other being the vernal equinox, when the sun is directly above the Equator, essentially dividing night and day into equal portions.

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So is the autumnal equinox, which marks the end of astronomical summer and the first day of fall in the Northern Hemisphere. The exact time of the fall equinox changes slightly each year. This year, the equinox arrives Sept.

During an equinox, places around the globe experience nearly equal amounts of daytime and nighttime. The second occurrence this year happens on Sunday.

If you get up early enough, you can experience an equinox sunrise. The autumnal equinox heralds the arrival of fall in the northern hemisphere.

The first day of fall arrives on Sunday with the autumn equinox, starting shorter, colder days because of Earth's axis and orbit around the sun.

The weekend takes a turn to wet and cool weather; Sunday’s highs 20 degrees cooler than Saturday’s summery weather The Equinox (Vernal & Autumnal) From the National: There are only two times of the year when the Earth’s axis is tilted neither toward nor away from the sun,