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The vernal equinox, and the autumnal equinox, happen in a single moment for the entire globe; they are not on-going phenomena that start at one time and end at a later time. The vernal equinox (in the north) will be March 20 2013 at 11:02 UT, which is for all practical purposes the same as 11:02AM, Greenwich Mean Time. This is the autumnal equinox in the Southern Hemisphere.
Each year the actual time of the equinox changes by several hours, a table showing all forthcoming times and dates can be found on the related link.
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JordanThe equinox occurs twice a year in March and September when the sun crosses the celestial equator, making day and night nearly equal in length. The specific date and time of the equinox can vary slightly each year, but it typically falls on March 20th or 21st for the spring equinox and September 22nd or 23rd for the fall equinox.
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When was the autumnal equinox in 1978?
The autumnal equinox in 1978 occurred on September 23rd. It marks the official start of fall when day and night are nearly equal in length.
What month does autumnal equinox start?
The autumnal equinox typically starts in September, specifically around September 22nd or 23rd in the Northern Hemisphere.
Are the days longer or shorter after the vernal equinox?
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.
Which of the following are valid names for the equinoxes?
fall equinox partial equinox
How many days of vernal and winter equinox is there?
There is 1 day for each equinox: the vernal equinox in spring and the winter equinox in winter.
