পৃথিবীর নিজ কক্ষপথে আবর্তন গতিকে কি বলা হয়?

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Dec 19, 2012 12:20 AM 1 Answers
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AnswersBD Administrator Dec 19, 2012 03:06 AM
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আহ্নিক গতি বলে ।

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