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PHYS 162 Elementary Astronomy - page 22 / 29

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PHYS 162 Class 1

PHYS 162 Class 1

Length of Day and Month are changing

Friction between the Earth and the Moon      (seen daily in tides)

Day  becomes .002 seconds longer each century

Moon receding from the Earth by 4 cm each year

500,000,000 years ago there were

         22 hours in a day

         400 days in a year

Billions of years in the future there will be

     1 “day” = 47 present days

     1 “month” = 1 “day”

Earth-Moon frozen with no additional spin for the Earth alone (later sees impact habitable planets in other Star systems)

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