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A great deal of human behavior, sometimes even our Biology, is linked to the day, the lunar month, and the year.

For example, the average human may spend approximately 8 hours asleep and 16 hours awake, for a total of one day.

An expectant mother will be pregnant for about 280 days, or about 10 lunar months.

Important changes in the weather happen at different points in the Earths orbit (the Year), the most important of which is the seasons. Different crops grow at different times of the year, and animals (that we may have hunted in the past) may migrate and become more or less available.

There are also, in the case of the deciduous forests of Europe and North American, stunning visual changes: in Autumn when the leaves change colour and fall from their trees, in Winter when the snows come and make the land white, and in Spring when the snows melt and the leaves and grass return. These all happen over a roughly 365 day cycle depending on where the Earth is on it's journey around the sun (the year).

So there have been historically excellent reasons to measure time (especially the day, the month, the season, and the year) based on the Earth's motions: lots of important things that happen to humans on Earth are inextricably linked with the Earth's motions.

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Ethel Kerluke

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โˆ™ 2022-01-27 22:45:29
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Q: Why do people use earth motions to determine units of time?
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Related questions

Why do people use earth motions to determin units of time?

becous earth moshi is regular so peple use them to meaure time


The day and the year as units of time are based upon motions of?

Calanders are based on the revolution of the earth around the sun.


Why do people use earth motion to determine units of time?

Days and years are obvious and convenient. Also, they don't suffer the "national bias" that is supposed to be such an impediment to standard units.


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Why is the earth divided into very long units of time


Are Day and year units of time are based upon the motions of the earth?

Yes, but different aspects of the Earth's motion. A day is the length of the rotation of the Earth (essentially turning around its own axis/center). A year is the length of time which the Earth moves around the Sun. Each time the Earth completes a whole revolution around the Sun, it has rotated approximately 365 and 1/4 times.


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