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Two times

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Q: How many times each year do we have days in which the day and night are equal?

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Equinox

3 Twice. On the Autumnal equinox and on the Vernal equinox.

The equinox is when, twice each year, day and night are of equal length (about 22 September and 20 March).

The time from one sunrise to the next is about 117 Earth days. The length of day and night are roughly equal at about 58 Earth days each.

"Equinox" comes from the Latin words for equal and night, because it describes the two times each year when day and night are of equal length as the sun crosses the celestial equator.

Except in a leap year, there are 28 days in the month of February. 28 days is equal to 4 weeks. Consequently, each day occurs exactly four times during the month.

Yes, all days are equal in time. The one day has 24 hours, each hour 60 minutes, each minute 6o seconds. The only difference is in the proportion of day time period to night time period.

Around here where I am, a month can be 28 days, 29 days, 30 days, or 31 days. 1 billion seconds is equal to . . . -- 413.36 months of 28 days each -- 399.11 months of 29 days each -- 385.80 months of 30 days each -- 373.36 months of 31 days each -- 31.69 years. (All are rounded.)

One month can equal each of those numbers of days.

The Equinox (Vernal & Autumnal) There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in a "nearly" equal amount of daylight and darkness at all latitudes. These events are referred to as Equinoxes

When the day and night are equal it is called the equinox (means literately equal night). It happens twice a year. Once in the sping called the vernal equinox which occurs on the March,20 or 21 each year. Once in the autumn or fall called the autumnal equinox which happens September, 21 - 22each year.

The two days of the year when there is exactly 12 hours of night and 12 hours of day are the equinoxes. They occur around the 20th of March and the 23rd of September each year.