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| A region of the sky; 88 official constellations cover the celestial sphere. |
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| The Sun's apparent annual path among the constellations |
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| The imaginary sphere on which objects in the sky appear to reside when observed from Earth. |
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| A point directly above either Earth's North or South pole. |
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| Stars near the north celestial pole that do not rise or set; rather they remain above the horizon and make daily COUNTERCLOCKWISE circles around the north celestial poles. |
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| The constellations along the ecliptic. Traditionally 12, but really there are 13. |
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| Occurs when Earth lies directly between the Sun and the Moon, so that Earth's shadow falls on the moon. |
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| Occurs when the moon lies directly between the sun and the Earth, so that the Moon's shadow falls on the Earth. |
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| Motion that is backward compared to the norm. |
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Mercury and Venus
Best seen just before sunrise or just after sunset. |
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Mars, Jupiter, and Saturn.
Seen overhead at midnight.
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| Move West to East compared to stars. |
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| Ptolemy's geocentric model |
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Definition
Universe revolves around the Earth.
Merry go rounds
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| Copernicus' Heliocentric Model |
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Definition
Earth and other planets revolve around the sun.
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Definition
| The oval planet's travel on. |
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| The average distance of Earth from the Sun, which is about 150 million km. |
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| Half of an ellipse's major axis. |
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