Question

Day and night are all over the earth in september 23rd. WHY?

Answer 1

It’s called the equinox, which is Latin for equal night, meaning that day and night are (roughly) equal at this time. There are two equinoxes, one in the fall and one in the spring.

You may have noticed that in winter, days are short and nights are long. In summer, the reverse is true. You can think of the year as divided into a dark half (more hours of darkness) and a light half (more hours of light). The equinoxes marks the transition point between these dark and light halves of the year.

The Earth is tilted on its axis with regard to the sun. When our hemisphere is tilted toward the sun, we get more hours of light. When we are tilted away, we get fewer hours of light.

The equinox occurs at the precise moment in Earth’s journey when the planet’s axis is neither tilted away nor toward the sun. Around this time, day and night are equal everywhere, from the poles to the equator. It’s a truly global event which really ought to be recognized and celebrated by all humanity.

Fun facts: the equinoxes don’t always fall exactly on the dates you mentioned. Sometimes they move around a day in either direction. Also, technically speaking, light and dark are not precisely equal on the day of the equinox, because of factors relating to the curvature of the Earth. But this comes down to a matter of seconds.

Answer 2

September 23 will have equal day and night. The sun will on Thursday cross the plane of the earth's equator making day and night of approximately equal duration. ... On the equinox day, the sun moves across the celestial equator which lies directly above the earth's equator

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