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On a Vernal or autumnal equinox.
about 3 months
fall equinox partial equinox
There is only two equinoxes, Autumnal equinox(fall) starts on Sept. 22 or 23, and Vernal equinox(spring) starts on March 20 or 21.
They would be the vernal equinox and the autumnal equinox.
spring equinox and autumnal equinox
The solstice is day of the year with the longest period of light (the summer solstice) or the longest period of night (the winter solstice). The vernal equinox (spring) and autumnal equinox (fall) are the two days in the year in which the periods of light and periods of darkness are exactly the same duration.
The autumnal equinox is also known as the fall equinox and the September equinox. An example of a sentence using "autumnal equinox" is "This year's autumnal equinox falls on a full moon. "
Autumn starts on the date of the Autumnal Equinox and winter starts on the day of the Winter Solstice.
The autumnal equinox is not in December. In the northern hemisphere it is in September. In the southern hemisphere it is in March. In December you have the winter solstice in the northern hemisphere and the southern hemisphere has the summer solstice. Equinoxes and Solstices happen on the 21st of their respective months, though occasionally then can be on the 20th or 22nd.
The vernal or autumnal equinox happens.
Different places have different definitions for when summer begins and ends. I go by the rule that summer begins at the moment of the summer solstice and ends at the moment of the autumnal equinox. In the northern hemisphere the date of the summer solstice ranges from June 19 to June 23, and the date of the autumnal equinox ranges from September 21 to September 24. In the southern hemisphere the date of the summer solstice ranges from December 20 to December 23, and the date of the autumnal equinox ranges from March 19 to March 22.