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General astronomy
Industry: علم الفلك
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General astronomy
نقطة الحضيض
علم الفلك; فلك عام
The point where (and when) an object's orbit ''about the earth'' in which it is closest to the earth; only applicable to objects orbiting the earth (not to objects orbiting the sun --- a common ...
مطلع مستقيم
علم الفلك; فلك عام
One element of the astronomical coordinate system on the sky, which can be though of as longitude on the earth projected onto the sky. Right ascension is usually denoted by the lower-case Greek ...
مركز الكتلة
علم الفلك; فلك عام
The center of mass of a system of bodies, such as the solar system. When a comet, for example, is well outside the orbit of Neptune (the farthest major planet), it sees the sun and major planets ...
وحدة فلكية
علم الفلك; فلك عام
Approximately equal to the mean earth-sun distance, which is about 150,000,000 km or 93,000,000 miles. Formally, the AU is actually slightly less than the earth's mean distance from the sun ...
القبة السماوية
علم الفلك; فلك عام
An imaginary sphere of arbitrarily large radius, concentric with the observer, allowing observers to plot positions of objects in the sky when their distances are unknown or unimportant.
