Depends whether you are in northern or Southern Hemisphere.
These days are when the sun passes over the Equator on its way to the other hemisphere's new season.
Vernal is spring, Autumnal is autumn. Because of the conspicuity of the autumn colours in N America, Fall has real meaning there. In my country only two trees are deciduous.
The longest day and shortest night occurs on the summer solstice. The shortest day and longest night occurs on the winter solstice. Midway between these points (2x a year) are the equinox, where the day and night are of equal length.
The vernal equinox occurs in March and marks the start of spring in the Northern Hemisphere, while the autumnal equinox occurs in September and marks the start of fall. During these equinoxes, day and night are approximately equal in length all over the world.
the vernal equinox is always on the 21 of march. that's the day I'm righting this. _______________________________ The equinoxes occur on March 21 and September 21, plus or minus one day because of the cycle of leap years. In the northern hemisphere, the vernal equinox is in March, and the autumnal equinox is in September; in the southern hemisphere, it's reversed. In 1978, the vernal equinox in the northern hemisphere was March 20, 1978 at 5: 10 PM GMT.
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".
An equinox occurs when the length of the day is equal to the length of the night. Here on Earth, it occurs around March 21 (the Vernal Equinox) and September 21 (the Autumnal Equinox).
For a vernal equinox, it occurs is March 20th. For an autumnal equinox, it occurs September 22nd.
The adjectives vernal and autumnal mean "of spring" and "of autumn (fall)" respectively. The equinox, when the day and night are even, occurs twice a year. Once in spring and once in autumn (fall) as we move from the extremes of the summer and winter solstices. Therefore we have a vernal equinox (in spring) and an autumnal equinox (in autumn/fall).
The "Vernal Equinox" is the beginning of "Spring" and the end of "Winter". The Autumnal Equinox is the beginning of "Autumn" or "Fall" and the end of "Summer". In the Northern Hemisphere, the Vernal Equinox is in March and the Autumnal Equinox in September each year.
On a Vernal or autumnal equinox.
Both.
fall equinox partial equinox
The equinox is either vernal (spring) or autumnal. It can't be both. But spring in the northern hemisphere is autumn in the southern.
Between vernal equinox and the autumnal equinox.
The longest day and shortest night occurs on the summer solstice. The shortest day and longest night occurs on the winter solstice. Midway between these points (2x a year) are the equinox, where the day and night are of equal length.
They would be the vernal equinox and the autumnal equinox.
On March 20 for the Northern Hemisphere (this is the autumnal equinox in the Southern Hemisphere). The vernal equinox for the Southern Hemisphere will be either September 22 or 23.
That is the Vernal Equinox; as opposed to the first day of Fall's Autumnal Equinox.