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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 ]
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the ...
[citation needed] [dubious – discuss] In large cities, about 300 to 500 stars can be seen depending on the extent of light and air pollution. [citation needed] The farther north, the fewer are visible to the observer. [citation needed] The brightest star in the night sky is located in the southern celestial hemisphere and is larger than the Sun.
Orion's seven brightest stars form a distinctive hourglass-shaped asterism, or pattern, in the night sky. Four stars—Rigel, Betelgeuse, Bellatrix, and Saiph—form a large roughly rectangular shape, at the center of which lies the three stars of Orion's Belt—Alnitak, Alnilam, and Mintaka. His head is marked by an additional 8th star called ...
Cygnus is one of the constellations that the Kepler satellite surveyed in its search for exoplanets, and as a result, there are about a hundred stars in Cygnus with known planets, the most of any constellation. [ 51 ] One of the most notable systems is the Kepler-11 system, containing six transiting planets, all within a plane of approximately ...
With an apparent visual magnitudeof −0.05, Arcturus is the brightest star in the northern celestial hemisphereand the fourth-brightest starin the night sky,[14]after Sirius(−1.46 apparent magnitude), Canopus(−0.72) and α Centauri(combined magnitude of −0.27). However, α Centauri AB is a binary star, whose components are each fainter ...
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