2007-12-21 08:55:17 · 3 answers · asked by baller babe 1 in Science & Mathematics ➔ Astronomy & Space
An equinox is when day and night are the same length as each other; "equinox" comes from the Latin and means "equal night." The exact moment of equinox is when the Sun passes directly overhead at some point on the equator. (Also, day and night are exactly the same length as each other on this day only at the equator; at other locations, they are just at their closest possible length to each other.) This happens twice during each revolution of the planet around the Sun. On Earth, we say that the seasons of spring and fall begin when the respective equinoxes occur.
2007-12-21 08:57:57 · answer #1 · answered by DavidK93 7 · 3⤊ 0⤋
It's when day and night are equal length all over the earth. At the equator they're the same length all the time.
At an equinox the axis of the earth is tilted exactly in line with its orbital track so sunlight is falling parallel to the plane of the equator. A picture or animation would be the best way to get the idea.
2007-12-21 09:02:04 · answer #2 · answered by Steve H 5 · 0⤊ 0⤋
The two days when day and night are equal every where.
The points are where the celestial equator meets the ecliptic and happens on21st march and 23rd September.
They will change after long period due to pricession of equinox
2007-12-21 10:07:39 · answer #3 · answered by Chandramohan P.R 7 · 0⤊ 0⤋