Page "Constellation" Paragraph 9
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The term circumpolar constellation is used for any constellation that, from a particular latitude on Earth, never sets below the horizon.
From the north pole, all constellations north of the celestial equator are circumpolar constellations.
In the northern latitudes, the informal term equatorial constellation has sometimes used for constellations that lie to the south of the circumpolar constellations.
Depending on the definition, equatorial constellations can include those that lie entirely between declinations 45 ° north and 45 ° south, or those that pass overhead between the tropics of Cancer and Capricorn.
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