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7:00 pm

Astronomy: Why is it 2021? The Sun, the Moon, and the Calendars we Keep

January 28 @ 7:00 pm - 8:00 pm

Dr. Lawrence Marschall, Professor of Physics Emeritus, Gettysburg College, discusses the astronomical aspects of the calendar.  WHY IS IT 2021? The Sun, the Moon, and the Calendars we Keep Though we seldom think about it, the calendar is based on astronomical observations—although how to define the year is decided by human convention. In this presentation,…

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