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6 Cards in this Set
- Front
- Back
calendar |
a way of showing days, organized into a schedule of larger units of time, such as weeks, months, seasons, or years; usually a table or a chart |
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celestial object |
any object that exists in space, such as a planet, a star, or the moon |
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revolution |
the time it takes for an object to orbit another object; Earth's revolution around the Sun is 365.24 days |
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rotation |
the turning of an object around an imaginary axis running through it |
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geocentric |
Aristotle earth centred in the solar system. helped predict when celestial bodies would rise and set, position of moon and sun but it could not explain the retrograde motion of mars, jupiter and saturn |
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heliocentric |
Nicholas Copernicus - we revolved around the sun - planets and sun on the same plane, a solar plane Kepler and Newton - Kepler: ellipses - Newton: gravity and gravitational force between two objects Because of this model, Uranus and Neptune were discovered |