slow rotation of the axis of a planet around another axis
retrograde motion
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how the position of an object changes with respect to its background when seen from different positions
parallax
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the idea that the earth is the center of the solar system
precession
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how planets seem to move backwards in their orbits
geocentrism
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a small circular orbit whose center moves around a larger circular orbit
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Question 2
2.
match vocabulary to definition
Draggable item
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Corresponding Item
astronomical unit
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a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant
semi-major axis
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finding the angle between the line of site from one side of an object to another
ellipse
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the distance from the center of an ellipse to furthest point
period
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the average distance from the earth to the sun
angular size
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the time interval of a repeating cycle
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Question 3
3.
In the equation
what do p and a stand for?
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Question 4
4.
hold your hand at arm's length away from your face. look with both eyes, and then alternate looking at your hand with just your right eye and just your left eye. The difference between what you see with just your left eye and just your right eye is an example of