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Day and Night

There are 24 hours in a day.

Day and night

The day is divided into "day(time)" and "night(-time)". Daytime is from sunrise (this varies, but we can say approximately 6am) to sunset (we can say approximately 6pm). Night-time is from sunset to sunrise.

Every day starts precisely at midnight.

AM (Ante-Meridiem = before noon) starts just after midnight. PM (Post-Meridiem=after noon) starts just after noon. This means that 12am and 12pm have no meaning.