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A celestial map by the Dutch cartographer Frederik de Wit, 1670. A star chart is a celestial map of the night sky with astronomical objects laid out on a grid system. They are used to identify and locate constellations, stars, nebulae, galaxies, and planets. [ 1 ] They have been used for human navigation since time immemorial. [ 2 ]
Zodiacal constellations of the northern sky are Pisces, Aries, Taurus, Gemini, Cancer, and Leo. In the southern sky are Virgo, Libra, Scorpius, Sagittarius, Capricornus, and Aquarius. [ 23 ][ a ] The zodiac appears directly overhead from latitudes of 23.5° north to 23.5° south, depending on the time of year.
Additionally, astronomers have found 6 white dwarfs (stars that have exhausted all fusible hydrogen), 21 brown dwarfs, as well as 1 sub-brown dwarf, WISE 0855−0714 (possibly a rogue planet). The closest system is Alpha Centauri, with Proxima Centauri as the closest star in that system, at 4.2465 light-years from Earth.
Cygnus is a northern constellation on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. [1] Cygnus is one of the most recognizable constellations of the northern summer and autumn, and it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross).
Capricornus is a faint constellation, with only one star above magnitude 3; its alpha star has a magnitude of only 3.6. The brightest star in Capricornus is δ Capricorni, also called Deneb Algedi, with a magnitude of 2.9, located 39 light-years from Earth. Like several other stars such as Denebola and Deneb, it is named for the Arabic word for ...
Celestial cartography, [1] uranography, [2][3] astrography or star cartography[citation needed] is the aspect of astronomy and branch of cartography concerned with mapping stars, galaxies, and other astronomical objects on the celestial sphere. Measuring the position and light of charted objects requires a variety of instruments and techniques.
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