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How do we know how many days to have in a year?

Question asked by: mrquestion

Asked on: 03 Feb 2010

It is not arbitrary.

The earth orbits the sun, and the time that it takes for the earth to fully orbit the sun is known as a year.

So from this figure and from our measurement of a day it is quite straightforward to work out how many days there need to be in a year and this works out as 365.25 roughly.

By: knowitall
Replied at: 03 Feb 2010
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