Revolution:The change of the earth around the sun.(انقلاب )
Revolution length:The long that the earth take to revolute around the sun.( طول الثورة)
Orbit: The imaginary line that help the earth revolute around the sun as circle. (مدار)
Ellipse: The earth orbit around the shape of oval.(القطع الناقص)
constellation:The group of the star that we see in sky is moving,but is the earth spinning.(كوكبة)
Aphelion:The far point to the sun.(الأوج)
Perihelion:The closet point to the sun.(الحضيض الشمسي)
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