What does equinox mean?

Question

Please explain it?

Answer 1

Daylight and dark should both last 12 hours, or 720 minutes, or 43,200 seconds allover the world. The vernal equinox is around March 21 and the autumnal equinox is around September 23. A solstice is the opposite -- summer solstice (for northern hemisphere) is around June 21 and day is as long as it ever gets, longest at high latitudes, and winter solstice is around December 22 (summer for southern hemisphere) when night is at it's longest. TRIVIA: you know why the 2 tropics (lines 23.5 north/south of equator) are called Cancer and Capricorn? Because that's the zodiac constellation that begins when the sun shines directly over them. It shines over the equator at equinox when either Aries (spring) or Libra (fall) being, hence the symmetrical shape of the 2 symbols.

Answer 2

the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox).

Answer 3

Definition - either of the two times each year (as about March 21 and September 23) when the sun crosses the equator and day and night are everywhere of equal length.

Answer 4

"equal night."

It denotes one of the 2 times of the year when day and night are both 12 hours long.