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| Frage | Antworten |
| Celestial Sphere | A sphere centered on Earth's center that represents the universe |
| Horizon | A local tangent plane that moves wight he observer |
| Zenith | The point directly above the observer |
| Nadir | The point directly below the observer |
| Latitude | Varies from 0 to 90 North or South |
| Longitude | Goes from 0 to 180 East or West |
| Horizon Coordinate System | Uses altitude and azimuth, where the horizon circle is the equator extended to the celestial sphere and the prime meridian connects the zenith, nadir, and the point on the sphere due north of the observer |
| North/South celestial poles | Projections of Earth's north and south poles onto the celestial sphere |
| Spherical Coordinates | Uses celestial poles and the vernal equinox to define the prime meridian with the celestial equator |
| Celestial Equator | Projection of the Earth's equator onto the celestial sphere |
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