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Astronomy and Astron

Marano- Astronomy and Astronomers

astronomy the study of all physical objects beyond the Earth's atmosphere
calendar system for organizing time based on astronomical observations
year time needed for a planet to make one complete orbit around the sun
revolution one complete orbit
How long does it take earth to make one revolution 365.242 days
What is our calendar called? Gregorian
Leap year happens every four years, add 1 day to calendar
Month time needed for moon to orbit the Earth
day time needed for a planet to turn itself on its axis of rotation
Angle of earth's rotation 235 degrees
How long does it take for the earth to make one rotation? 24 hours
Why do we have day and night? only half the Earth can face the sun and have daylight
Ptolemy Geocentric model- earth is center of universe
Copernicus Heliocentric- sun is the center of the universe
Brahe Believed that planets revolve around sun, but sun and moon revolve around Earth
Kepler believed that planets revolve around sun in elliptical orbits
Galileo first person to use telescope
Newton Gravity is the force that keeps all objects in orbit
Newton's law of universal gravitation the higher the gravity, the more mass or the closer objects are together
Created by: seagullq