Hour circle, in astronomy, a secondary axis in the equatorial coordinate system. The hour circle of a celestial body is the great circle on the celestial sphere that passes through both the body and the north celestial pole. A star's hour circle is used in determining its right ascension and declination.
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Standard time, civil time used within a given time zone. The earth is divided into 24 time zones, each of which is about 15° of longitude w...
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Comet, a small celestial body consisting mostly of dust and gases that moves in an elongated elliptical or nearly parabolic orbit around the...
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Jupiter, in astronomy, 5th planet from the sun and largest planet of the solar system. Astronomical and Physical Characteristics Jupiter...