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Midnight

physical science Maturity 7-9 Next article →

Midnight is a very special moment in time. It is the transition from one day to the next. On a clock, midnight is the opposite of noon. They are exactly twelve hours apart. Most people think of it as the start of a new day. This time is often shown as 00:00 on digital clocks.

Midnight Mist
Midnight Mist

There are two different ways to think about midnight. The first is clock time. This is the time on your local official clock. The second is solar midnight. This happens when the Sun is at its lowest point. This point is called the nadir. At solar midnight, the night is the same distance from sunset and sunrise. Because of time zones, solar midnight rarely matches 12 midnight on the clock.

Tour de l'horloge de la gare de Metz à Minuit (juin 2019) (cropped)
Tour de l'horloge de la gare de Metz à Minuit (juin 2019) (cropped)

People have measured midnight in many ways throughout history. In ancient Rome, midnight was halfway between dusk and dawn. This meant it changed with the seasons. Some languages also link midnight to a direction. In Polish, Belarusian, Ukrainian, and Serbian, the words for midnight also mean north. This is a unique way that language connects time to the world.

Midnight Mist
Midnight Mist

Using names for midnight can be a hard job. The term a.m. means before noon. The term p.m. means after noon. Since midnight is twelve hours from noon, neither name is strictly correct. In the United States and Canada, many computers show 12 a.m. at midnight. The 2008 U.S. Government Style Manual says to use 12 a.m. for midnight. However, the 2000 edition recommended the opposite.

Tour de l'horloge de la gare de Metz à Minuit (juin 2019) (cropped)
Tour de l'horloge de la gare de Metz à Minuit (juin 2019) (cropped)

To avoid mistakes, experts have many clever ways to show the time. The NIST suggests using 11:59 p.m. or 12:01 a.m. instead. This helps when a contract or legal paper needs a clear time. You can also use a 24-hour clock to stay clear. Some people write midnight as 24:00 to show the end of a day. The ISO says 00:00:00 can mark the start of a day. This helps everyone understand exactly when a new day begins.

Midnight Mist
Midnight Mist
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