وفر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.

اشترك الآن

تمت عملية الاشتراك بنجاح

إغلاق

عذراً، عذرا،أنت مشترك مسبقاً بالنشرة البريدية

إغلاق

عذراً، هناك مشكلة في البريد الالكتروني

إغلاق
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فضاء وفلك

الهلال |  Crescent

18 يوليو 2019


الهلال هو طور القمر الذي يظهر مباشرةً بعد المحاق، عندما يبدأ أول جزء منير من القمر بالظهور. يظهر مباشرةً بعد غروب الشمس، ويتم رصده لتحديد بداية الشهر القمري بالرؤية وبالتحديد في رمضان. يوماً بعد يوم يتحرك القمر في مداره ويزيد الجزء المنير من القمر ويكبر حجم الهلال.