Our calendar is 365 days, but it actually takes 365-1/4 days for the Earth to orbit the sun, so every four years, we add a day to February. You probably already know this, but I find it fascinating that they were able to figure all of this out without the use of technology. Back in the BC/AD years, they figured out the calendar based on nothing more than astronomer's observations. That's a pretty incredible feat, don't you think?
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