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PHYS 162 Elementary Astronomy - page 28 / 29

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PHYS 162 Class 1

PHYS 162 Class 1

365.242 days in a year - not on tests

“Ancient” calendars were Lunar

 Babylon - 12 months 6 with 29 days and 6 with 30. Add 13th month occasionally (also used in India and similar in China)

 Egypt - 12 months each 30 days plus 5 extra

 Polynesia - 13 lunar months drop 1 occasionally

Priests would determine when to add extra months and day

Very  tempting to have 360 days in a year and 12 months of 30 days. “nice” numbers

    Lack of correlation between day-month-year “bothered” philosophers and theologians.  Understanding this “random” motion (and the planets were even worse) by Copernicus, Kepler, Galileo, Newton gave us modern science

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