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When night and day are approximately of equal length occurs twice per year.

In the northern hemisphere these days are called the Vernal Equinox (20-21 March) and the Autumnal Equinox (22-23 September).

However, as these seasons are reversed in the southern hemisphere, current usage is the March Equinox and the September Equinox.

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โˆ™ 2010-01-25 21:06:35
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Q: How many times per year do you have days in which the number of hours day and night equal what are the names of those days?
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