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astronomy
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10
Astronomy
9th Grade
02/04/2014

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Term
barycenter
Definition
the center rotating objects
Term
precession
Definition
a slow motion of Earths axis that traces out a cone over a period of 26,000 years
Term
nutation
Definition
a rocking, swaying, or nodding motion in the axis of a planet
Term
rotation
Definition
the spinning of a body, such as earth, about an axis
Term
accretion
Definition
the process that occurs when crustal fragments collide with and stay connected to another crustal plate
Term
ellipse
Definition
an oval
Term
equinox
Definition
the time when the sun crosses the plane of earth's equator making day and night
Term
perihelion
Definition
the point in orbit of a planet where it is closest to the sun
Term
aphelion
Definition
the place in an orbit where the planet is farthest from the sun
Term
revolution
Definition
the motion of one body about another as earth moves about the sun
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