What Is Each 24-Hour Cycle of Day and Night Called?
Last Updated Mar 31, 2020 6:14:44 PM ET
Each 24-hour cycle of day and night on Earth is known as a day. A day is the period of time it takes for the Earth to complete one full rotation about its axis.
There are 365.25 days in one year. The extra quarter of a day collects every four years to produce a leap year, which has 366 days. February is always the month that collects this extra day, meaning there are 29 days in February during a leap year. The leap day has been used far back as 46 B.C., when it was first added to the Julian calendar.
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