josferik

josferik

An optical surface with departures in shape from a perfect sphere in order to cancel optical imperfections or aberrations.

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نوع المصطلح: اسم
المرادف (المرادفات)
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المجال / النطاق: علم الفلك
الفئة: فلك عام
Company: Caltech
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The interval of time in days (and fraction of a day) since Greenwich noon on Jan. 1, 4713 BC. The JD is always half a day off from Universal Time, because the current definition ...

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Angular distance of a celestial object from the sun in the sky. In standard ephemerides, this is usually denoted by the Greek letter epsilon (or by the abbreviation "Elong. "). A ...

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المجال / النطاق: الأنشطة الرياضية الفئة: كرة السلة

top i vdekur

(basketball term) any ball that is not live; occurs after each successful field goal or free-throw attempt, after any official's whistle or if the ...