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Celestial Object
A natural object located outside of Earth's atmosphere
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Astronomer
Someone who studies space
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Revolution
An orbit around the sun
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Rotation
An orbit around a planet's own axis
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Constellation
A group of stars
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Apparent Magnitude
The measurement for the brightness of a star
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Asterism
A pattern of stars within a constellation
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Pointer stars
Stars that point to a constellation or star more significant that itself
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Circumpolar
A constellation that can be viewed throughout the year
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Zenith
The point in the sky directly above the observer
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Tides
The gravitational push/pull of the water due to the moon
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Phases of the moon
The different amounts of illuminations of the moon as it orbits the earth
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Lunar eclipse
When the Earth gets in between the Sun and the Moon
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Solar eclipse
When the Moon gets in between the Sun and the Earth
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Why do we have seasons?
Because the earth is tilted 22.5 degrees, and as it rotates, different parts of the earth are exposed to the Sun
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Planet
An object that orbits a star, is not a star, is spherical, and doesn't share its orbit with another object
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Inner Planets
Any planet within the asteroid belt (relative to the sun)
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Outer planets
Any planets outside of the asteroid belt
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Solar system
A group of planets that circle one or more stars
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Retrograde motion
The apparent motion when Mars, Jupiter, and Saturn move along with the fixed stars due to Earth's rotation. It then seems as if they are "wandering" because they are against the fixed stars.
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Astronomical Unit
A unit of measurement (distance) which is the distance from the Earth to the Sun
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Orbital radius
The average distance between an object orbiting the Sun and the object.
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Geocentric Model
The theory that every object in the solar system rotated around the earth
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Heliocentric model
The more updated theory that states that everything in the Solar System rotates around the Sun
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