الثابت الشمسي
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<timefyi-glossary slug="solar-constant"></timefyi-glossary>التعريف
مقدار الطاقة الشمسية المستلمة خارج الغلاف الجوي للأرض على مسافة واحدة وحدة فلكية، وتبلغ نحو 1361 واط لكل متر مربع.