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Astronomy
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10
Astronomy
9th Grade
02/06/2014

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