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Comparing Coordinate Systems
Grade Level
Astronomy
AST.055 Comparing Coordinate Systems
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A hiking group uses a simple star finder that gives cardinal directions and height above the horizon for a bright planet after sunset. Which coordinate system is best suited to the task, and what is its main limitation?
A
Horizon (altitude-azimuth) coordinates; primary use: local altitude and compass direction; main limitation: values change with observing time and location.
B
Galactic coordinates; primary use: Milky Way directions and structure; main limitation: it is not a direct local-pointing or Solar System frame.
C
Ecliptic coordinates; primary use: Solar System motion relative to Earth's orbital plane; main limitation: it is not direct for local observing or Milky Way structure.
D
Equatorial coordinates (right ascension and declination); primary use: shared star catalogs and celestial directions; main limitation: local pointing still requires time and site conversion.
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