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History of Gregorian Calendar

Further reading: http://en.wikipedia.org/wiki/Gregorian_calendar PLEASE DO NOT REPORT THIS VIDEO. I KNOW I'VE UPLOADED THIS VIDEO WITHOUT PERMISSION, BUT PLEASE, I UPLOADED THIS VIDEO FOR EDUCATION PURPOSES ONLY, AND I DON'T GAIN ANY PROFIT FROM THIS. PLEASE, DON'T BE A JERK THAT ALWAYS INTERUPT OTHERS WHILE THEY ARE HAVING FUN. THANK YOU.

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