The autumnal equinox usually falls on either 22 or 23 September, while the spring equinox occurs on either 20 or 21 March. Autumnal Equinox – Southern Hemisphere (Australia, New Zealand, South America, southern … There's also another, more common definition of when the seasons start, namely meteorological definitions, which are based on average temperatures rather that astronomical events. In the Northern Hemisphere, the fall equinox marks the first day of fall (autumn) in what we call astronomical seasons. Here’s all you need to know! Why do we mark the equinox? The autumnal equinox usually falls on either 22 or 23 September, while the spring equinox occurs on either 20 or 21 March. Fall begins in the Northern Hemisphere and spring begins in the Southern Hemisphere. In 2020, the autumnal equinox —also called the September equinox or fall equinox —arrives on Tuesday, September 22. Equinoxes occur on 20 th or 21 st March and 22 nd or 23 rd September each year and both days have equal length of the day and the night. In the Northern Hemisphere the autumnal equinox falls about September 22 or 23, as the Sun crosses the celestial equator going south. Still, before we get into the matter of when the autumnal (or fall) equinox is set to take place this year (and therefore the first day of fall), it's important to know what an equinox even is. This year’s autumnal equinox is on Tuesday 22 September – the earliest date it can fall, with the latest being 24 September. In the Southern Hemisphere the equinox occurs on March 20 or 21, when the Sun moves north across the celestial equator.
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