Day and Night
There are 24 hours in a day. 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
midday. This means that 12am and 12pm have no meaning.
This diagram shows the cycle of a 24-hour day and the words we use to describe its parts. The day starts at midnight (at the bottom of the diagram).
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