The spring and autumn equinox.
The two days are known as the Equinox. The spring Equinox (typically June 21) is known as the "Vernal Equinox". The fall Equinox (Typically September 21) is known as the "Autumnal Equinox".
The duration of insolation is the same everywhere on the days of the equinoxes - around March 20-21 for the vernal (spring) equinox and around September 22-23 for the autumnal equinox. During these times, the sun is directly above the equator, resulting in approximately equal day and night lengths worldwide.
The Sun crossing the celestial equator going north is known as the vernal equinox or the first day of spring. This event marks the beginning of longer days and shorter nights in the Northern Hemisphere, signifying the start of the spring season. It occurs around March 20th each year.
Each of the two days of the year when neither hemisphere is tilted toward or away from the sun is called an equinox. This marks the time when day and night are roughly equal in length around the world.
The spring equinox is March 21, The fall equinox is September 23
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The word is "equinoctial" = equal day and night. It occurs twice a year, on the first day of Spring, and the first day of Autumn.
There is 1 day for each equinox: the vernal equinox in spring and the winter equinox in winter.
The Autumn equinox and the Spring equinox .
The spring and autumn equinox.
The two days are known as the Equinox. The spring Equinox (typically June 21) is known as the "Vernal Equinox". The fall Equinox (Typically September 21) is known as the "Autumnal Equinox".
The Autumnal equinox. It comes on September 22nd.
After the vernal equinox, the days become longer as the Northern Hemisphere tilts towards the sun. This allows for more daylight hours and the start of spring.
There are two days each year when the day and night are of equal duration, known as the equinoxes. The vernal (spring) equinox occurs around March 21st, marking the beginning of spring in the Northern Hemisphere, while the autumnal equinox occurs around September 22nd, marking the beginning of autumn.
Spring and Fall Equinox
In 2008, spring, as defined as the period from the vernal equinox to the summer solstice, lasted 92 days, 18 hours and 11 minutes.