Leap years are needed because a. the earths orbit is not a perfect circle b. the length

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Leap years are needed because
a. the earth’s orbit is not a perfect circle
b. the length of the day varies
c. the length of the year varies
d. the length of the year is not a whole number of days

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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