In the hour angle system, the complementary angle of polar distance is called ______.

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Multiple Choice

In the hour angle system, the complementary angle of polar distance is called ______.

Explanation:
In the hour angle system, the polar distance is the angular distance from the celestial object to the celestial pole, while the declination is the angular distance from the object to the celestial equator. The pole and the equator are 90° apart, so these two angles add up to 90°. That makes declination the complement of polar distance. Co-altitude is 90° minus altitude, not related to this relationship; the zenith is the point overhead, and altitude is the angle above the horizon.

In the hour angle system, the polar distance is the angular distance from the celestial object to the celestial pole, while the declination is the angular distance from the object to the celestial equator. The pole and the equator are 90° apart, so these two angles add up to 90°. That makes declination the complement of polar distance. Co-altitude is 90° minus altitude, not related to this relationship; the zenith is the point overhead, and altitude is the angle above the horizon.

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