Autumn is right around the corner for everyone in the Northern Hemisphere, while those in the Southern Hemisphere are getting ready for spring.
The season will change on either Sept. 22 or 23 in your area. The equinox is not a day long event. The position of the Earth and the sun at a specific moment in time is what determines the equinox.
There are many sources of confusion regarding the date of the equinox. The autumnal equinox can happen at any time between Sept. 21 and 24. There are five odd facts about fall.
On September 22nd, at 9:06 p.m. The sun will cross the equator or an imaginary line in the sky. The term "equinox" refers to the fact that the length of day and night will be equal around the world at this exact moment.
This occurs on either Sept. 22 or 23 most of the time. The autumn equinox can happen on September 21 or 24. The time it takes for Earth to travel around the sun is less than the time it takes for a calendar year to end. Leap years have been observed for the last two thousand years. Adding a "leap day" every four years has helped us keep our seasons consistent.
Leap years don't guarantee that the equinoxes fall on the same day. The start of the seasons can be changed by a day or two because of leap years.
According to timeanddate.com, the last autumnal equinox was over a thousand years ago. We can expect to see it happen twice in the next century, first in 20 92 and then in 20 96. September 24th will be in the year 2343. The dates listed here are based on Universal Time, so some time zones might not experience these equinoxes.
The time and date of the autumnal equinox have been changed.
It was originally published on Space.com
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