
العداد الشمسي
أرسطرخس الساموسي
( بالانجليزية : Aristarchos Samos )
( باليونانية : Ἀρίσταρχος )
عالم فلك ورياضيات يوناني
الميلاد : 310 ق.م
الوفاة : 230 ق.م ( 80 سنة )

يعتبر أرسطرخس مخترع العداد الشمسي النصف الكروي.
وله الفضل في القول بدوران الأرض حول الشمس وتكريس هذه الحقيقة.
إلا أن هذه الحقيقة لم يتقبلها معاصروه رغم ما أدت إلى تفسيره من ظواهر.

قام أرسطرخس بقياس بعد الشمس والقمر عن الأرض وحجميهما ،
وعرف أن طول السنة الشمسية المعروف ( ثلاثمائة وخمسة وستين يوما ً وربع اليوم ) كان فيه شيء من التقريب
لذلك أضاف له تصحيحاً مقداره 0.0006161 من اليوم أي حوالي ثلاثاً وخمسين ثانية.

المراجع :






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