The reason for the same appearance of the sky at 1 A .M . on July 1 and 9 P .M . on September 1 as that on 11 P .M . on August 1.

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Chapter 2, Problem 12Q

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The reason for the same appearance of the sky at 1 A.M. on July 1 and 9 P.M. on September 1 as that on 11 P.M. on August 1.

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