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6 Cards in this Set

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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

celestial object

any object that exists in space, such as a planet, a star, or the moon

revolution

the time it takes for an object to orbit another object; Earth's revolution around the Sun is 365.24 days

rotation

the turning of an object around an imaginary axis running through it

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

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