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What is an equinox, and why does it happen?

The equinoxes (from “equi,” meaning “equal,” and “nox,” or “night”) occur when the sun’s rays strike the equator at noon at an angle of 90 degrees. In the Northern Hemisphere, the vernal or spring equinox occurs around March 20, and the autumnal or fall equinox occurs on September 22 or 23. During the equinoxes,...

What does the name Equinox mean?

noun 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). either of the equinoctial points.

What is equinox used for?

Even today, the spring, or "vernal" equinox is often used to indicate the first day of spring , but what it really signifies is the astronomical start of spring, as opposed to the meteorological one.

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