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Scoop.it!
The megalithic stone structure may have been used as an astronomical calendar. 
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Friend me on Facebook! http://on.fb.me/gCSs8F My video for the new year! SOURCES: http://www.obliquity.com/calendar/ http://www.exovedate.com/a_history_of_th... Via Cornélia Castro
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Scientists have discovered the oldest solar observatory in the Americas and, in the process, may have solved a centuries-old puzzle about the purpose of an ancient stone fort on a remote hilltop in Peru.
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Why Do We Need Leap Days? | The Leap Year Schedule | How We Sync the Calendar with Astronomical Time
Leap days are necessary to keep the Gregorian calendar synced up to actual astronomical measures of the passage of time. The leap schedule is slightly more complicated than most people think.
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Forget leap years, months with 28 days and your birthday falling on a different day of the week each year.
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