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| the time or date (twicea year) at which the sun crosses the celestial equator, when day + night are of equal length |
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| the point in the orbit of a planet, asteroid or comet at which its closest to the sun |
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| the point in the orbit of a planet, asteroid or comet at which it is the furthest from the sun |
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| the common center of mass around which 2 or more bodies revolve |
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| the motion of the axis of a spinning body such as the wobble of a spinning top when there is an external force |
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| a periodic variation in the inclination of the axis of rotationg object |
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| the action of rotationg around an axis or center |
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| the process of growth or increase, typically by the gradual accumulation of additional layers of matter |
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