HOW TO: Calculate 1 Year On Earth [Video]

I’m gonna ask you a quick question: How do you calculate that 1 year has passed on Earth? The answer may seem simple enough, but it is not. The problem is that our planet does not return to its starting point once it was gone all the way around the sun, so how do you know when a year starts and when it ends? Check out this interesting video to find out.


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