The Harvest Moon
It used to be called "The First Point of Aries", because it was located just inside the constellation Aries. However, due to precession the 'point' shifts over time.
Well, it's importance is relative. First of all, it signifies the first day of Spring in the Northern Hemisphere and the first day of Autumn in the Southern Hemisphere. Equinox means "Equal Night", in other words, both the Northern and Southern Hemispheres receive equal amounts of day time and night time on this day. Does that help?
The sun appears to cross the celestial equator twice in the course of one year. The point in the sky where the sun appears to cross the celestial equator on its way south is called the Autumnal Equinox. The moment when it appears to be in that position is called the "Beginning of Fall" in the northern hemisphere. The point in the sky where the sun appears to cross the celestial equator on its way north is called the Vernal Equinox. The moment when it appears to be in that position is called the "Beginning of Spring" in the northern hemisphere.This happens at the equinox, which is around March 21 and September 21. (The date varies a day or so either way, depending on the cycle of leap years.)If you need to know exactly when this is, you can look that up on the US Naval Observatory's web site on the "Earth's Seasons" page (linked below).
Equinox happens twice a year. The Vernal equinox is also called the Spring equinox in the Northern Hemisphere. The 2014 Vernal equinox was on March 20, 12:57 P.M. EDT.
This happens twice a year at on of the "equinox" (the spring equinox or the fall equinox) At noon if you are on the equator at thet oment the Sun is at the "Zenith".
The autumnal equinox.
It's called the Equinox, which happens biannually, one called Vernal Equinox (Spring), and one called Autumnal Equinox (Fall).
The first day of autumn is called the autumnal equinox.
There is an equinox in the spring called the vernal equinox, and one in the fall called the autumnal equinox. They happen at the moment that the center of the sun is in the earth's equatorial plane. In other words, they occur at the moments when the sun passes directly over the equator.
Autumnal equinox
The length of day and night is equal at the Vernal and Autumnal equinox.
The length of day and night is equal at the Vernal and Autumnal equinox.
A second harvest is sometimes called a full moon harvest. This may occur if harvest time is close to the autumnal equinox.
Its called an equinox. There is the Spring and the Autumnal Equinox. This occurs when the Sun is directly above the equator. It means equal day, where the days and nights are of the same length. See the related link for more information.
It is called the Autumnal Equinox. It is the day of equal daylight and darkness following the Summer Solstice. The first day of Spring is called the Vernal Equinox. It is the day of equal daylight and darkness following the Winter Solstice.
It used to be called "The First Point of Aries", because it was located just inside the constellation Aries. However, due to precession the 'point' shifts over time.
It is called an equinox. In the spring it is known as the Vernal Equinox while in the autumn it is known as the Autumnal Equinox. Both take place around the 21st of March/September, but the date varies slightly each year.