When Will Fall Equinox Be on September 21 Again?
For us in the Northern Hemisphere, the sunday is rising later now, and nightfall comes sooner. Autumn arrives. Meanwhile, s of the equator, bound begins.
What is it? The September equinox marks the sun's crossing above Earth's equator, moving from north to s.
When is the adjacent ane? The side by side September equinox will fall at one:04 UTC September 23, 2022 (20:04 CDT on September 22 for central North America); translate UTC to your fourth dimension).
Note: On this equinox, the lord's day crosses above Earth's equator, moving from north to s. For everyone across the earth, days and nights are approximately equal in length. The name equinox comes from the Latin aequus (equal) and nox (night).
Read: Why aren't solar day and night exactly equal on the equinox?
What is an equinox?
The primeval humans spent more time outside than we do. They used the heaven as both a clock and a agenda. They could hands encounter that the sun'south path across the sky, the length of daylight, and the location of the sunrise and sunset all shift in a regular way throughout the twelvemonth.
Today, we know each equinox and solstice is an astronomical event. Information technology's caused by World'south tilt on its axis and incessant orbit around the sunday. Earth is tilted by 23 one/2 degrees. And that means Globe's Northern and Southern Hemispheres trade places throughout the year in receiving the sun'due south light and warmth well-nigh directly.
We accept an equinox twice a year – spring and fall – when the tilt of the Earth's axis and Earth's orbit around the lord's day combine in such a way that the axis is inclined neither away from nor toward the dominicus. World's two hemispheres are receiving the sun's rays about as effectually equinox time. The sun is overhead at noon equally seen from the equator. Night and twenty-four hour period are approximately equal.
Of form, World never stops moving around the sunday. Then these days of approximately equal sunlight and dark volition change quickly.
A practiced day to find due eastward and due w
The 24-hour interval of an equinox is a good day for finding the directions due eastward and due westward from your favorite place to watch the sky. That's because, more often than not speaking, the sun rises due e and sets westward at the equinoxes. It's true no matter where you alive on Earth. Why? Because we all see the same heaven.
Everywhere on Earth, except at the Northward and South Poles, y'all have a due east and westward point on your horizon. That betoken marks the intersection of your horizon with the celestial equator – the imaginary line above the truthful equator of the Earth.
At the equinoxes, the sunday appears overhead at noon as seen from Globe'southward equator, as the illustration beneath shows.
And then go outside effectually dusk or sunrise, and detect the location of the sun on the horizon with respect to familiar landmarks. If y'all do this, you lot'll be able to employ those landmarks to find those cardinal directions in the weeks and months ahead, long later on Earth has moved on in its orbit effectually the lord's day, carrying the sunrise and sunset points southward.
Signs of the September equinox in nature
The knowledge that summertime is gone – and winter is coming – is everywhere now, on the northern half of Earth'southward earth. If you live in the Northern Hemisphere, you lot can easily notice the afterward dawns and earlier sunsets. Also discover the arc of the sun beyond the sky each day. You'll find information technology'south shifting toward the southward. Birds and butterflies are migrating southward, too, forth with the path of the lord's day.
The shorter days are bringing cooler atmospheric condition. A chill is in the air. In New York City and other stylish places, some people accept stopped wearing white. Creatures of the wild are putting on their wintertime coats.
All around us, trees and plants are ending this year'due south cycle of growth. Perhaps they are responding with glorious fall leaves, or a final burst of flower before wintertime comes.
In the dark sky, Fomalhaut – the Autumn Star – is making its way across the heavens each night.
Read: Year's fastest sunsets at equinox
Equinox images from EarthSky'due south community
Lesser line: The equinox – a seasonal signpost in Earth'due south orbit effectually the sunday – volition arrive at 01:04 UTC on September 23, 2022. The sun will exist exactly above World's equator and so, moving from north to south.
Source: https://earthsky.org/astronomy-essentials/everything-you-need-to-know-september-equinox/
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