![]() The fall and spring equinoxes, the seasons, and the changing length of daylight hours throughout the year are all due to one fact: Earth spins on a tilted axis. This will happen at 3:21 pm Eastern on Wednesday (for some parts of the world, it will be Thursday morning at this time).īelow is a short scientific guide to the most equal night of the season. Technically speaking, the equinox occurs when the sun is directly in line with the equator. This week’s full moon - the closest to the fall equinox, and this year the last full moon of summer - occurs on Tuesday and is known as the harvest moon. For those south of the equator, it’s the beginning of spring. The autumnal equinox is upon us: On Wednesday, September 22, the Northern and Southern hemispheres will experience an equal amount of daylight.įor those in the Northern Hemisphere, it marks the beginning of astronomical fall, with daylight hours continuing to shorten until the winter solstice in December.
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