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PHYS 162 Elementary Astronomy - page 21 / 29

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PHYS 162 Class 1

PHYS 162 Class 1

Markers of Time

DAY: Sun at maximum height

MONTH: length of time it takes for the moon to make an orbit around the Earth (repeats phase every 29.5 days).                     Most early cultures use the day and month to mark time

moon-month-measure-man    may all have the same root

YEAR: Time it takes for Earth to orbit Sun                                         - changes of seasons                                                                         - changes of which stars are visible during the year              

Due to Earth’s daily motion and orbit around the Sun                        Stars can serve as Clock and Calendar                                       Star can serve as a navigational aide      

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