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In the northern hemisphere is is the 21st of September. In the Southern Hemisphere it is the 21st of March.

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10y ago

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When day and night are equall?

Autumn equinox and spring equinox I believe...


What is the name Of the first day Of Autumn?

The first day of autumn is called the autumnal equinox.


What is the term for when days and nights are equal in length?

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.


When day and night are equal called?

It is called equinox. Equinox happened 2 times per year on spring and autumn so called the name spring equinox and autumn equinox.


What do you call the day when autumn officially begins?

equinox


What does autumnal equinox mark the first day of?

Autumn


What are solstices and equinox how are they related to seasons?

There are two solstices. they are the summer solstice (first day of summer), and the winter solstices (first day of winter An equinox is when day and night are the same length. like solstices, there are two of them. The Autumn equinox (first day of autumn), and then the spring equinox (first day of spring).


What are solstices and equinox and how are they related to the seasons?

There are two solstices. they are the summer solstice (first day of summer), and the winter solstices (first day of winter An equinox is when day and night are the same length. like solstices, there are two of them. The Autumn equinox (first day of autumn), and then the spring equinox (first day of spring).


Happy autumnal equinox?

The equinox happens on Sept. 22. It marks the first day of autumn.


What name is given to the two days when the night is equal to the day?

The Autumn equinox and the Spring equinox .


The equinox indicates the first day of .?

Autumn.It is regarded by some as the start of Autumn. There are different perspectives on when exactly Autumn starts, but for some it is the Autumnal equinox.


At the autumn equinox are the hours of the day and night equal?

true