The 2023 autumnal equinox arrives Saturday at 2:50 a.m. Eastern time.
solstices and marks the precise moment when the sun appears directly over the Earth’s equator.
The exact time of the equinox varies each year. While the autumnal equinox usually occurs on Sept. 22 or 23, it occasionally falls outside those dates. An early Sept. 21 equinox last happened over 1,000 years ago, but it will happen again later this century — in 2092 and 2096, . On the other hand, a late Sept. 24 equinox occurred as recently as 1931 but won’t happen again until 2303.During the September equinox, the sun’s direct rays cross Earth’s equator into the Southern Hemisphere, where spring is beginning. In the Northern Hemisphere, we’ll continue to lose daylight until the winter solstice, as the sun traces a shorter and lower path across the sky.
by about 23.5 degrees, the Northern and Southern Hemispheres receive different amounts of sunlight throughout the year. On the spring and autumnal equinoxes, however, both hemispheres receive equal amounts of the sun’s energy, causing day and night to be nearly equal everywhere on Earth.Though “equinox” comes from the Latin words “aequus” and “nox” , the Earth actually sees more than 12 hours of daylight during the equinox.
” — the day when sunrise and sunset are 12 hours apart — happens three days later. In most of the United States, the equilux occurs on Sept. 25 or 26. Not until March 16 will the sun again grace our skies for at least 12 hours.One is how we define the term “sunrise” and “sunset” to measure the length of a day. The sun appears as a disk, not a discrete point in the sky like a nighttime star.
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