nadir

nadir

The point on the celestial sphere that is diametrically opposite the zenith, so that the zenith, nadir and center of earth are in one straight line. It is always 90 degrees below the horizon.

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التحسين

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نوع المصطلح: اسم
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مسرد المصطلحات
المجال / النطاق: علم الفلك
الفئة: المريخ
Company: NASA
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