9. ب.2- حساب زمن دورة حركة الكرة الأرضية.
نستخدم التعبير لزمن دورة حركة القمر الاصطناعي، لحركة الكرة الأرضية حول الشمس.
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نعبر عن زمن الدورة بالساعات والأيام:
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