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| The concept of an Earth centered universe. |
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| An imaginary hollow sphere upon which the ancients beleived the stars were hung and carried around Earth. |
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| The view that the sun is at the center of the solar system. |
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| An Earth-centered system of the universe. |
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| The apparent west-ward motion of the planets with respect to the stars. |
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| The average distance from the Earth to the Sun. |
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| An apparent group of stars originally named for mythical characters. The sky is presently divided into 88 constalations. |
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| The gravitational disturbace of the orbit of one celestial body. |
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| A method of locating stellar objects much like the coordinate system used on Earth. |
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| The angular distance north or south of the celestial body equator denotationing the posittion of the celestial body |
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| An angular distance measured eastward along the celestial equator form the vernal equinox. Used with declanation in a coordinate system to describe the positioning of a celestial body. |
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| The spinning of a body, such as Earth, about its axis. |
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| The motion of one body about another, as Earth around the Sun |
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| A slow motion of Earth's axis that traces out a cone over a period of 26,000 years. |
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| The average time between two passages of the Sun across the local celestial meridian. |
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| The period of Earth's rotation with respect to the stars. |
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| The point in the orbit of a planet where it is closest to the Sun. |
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| The point in the orbit of a planet where the planet is farthest form the Sun. |
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| The imaginary plane that connects Earth's orbit with the celestial sphere. |
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| The period of revolution of the Moon with respect to the Sun, or its cycle of phases. |
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| A time period based on the revolution of the Moon around Earth with respect to the stars. |
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