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c. 300 BC — star catalog of Timocharis of Alexandria; c. 134 BC — Hipparchus makes a detailed star map; c. 150 — Ptolemy completes his Almagest, which contains a catalog of stars, observations of planetary motions, and treatises on geometry and cosmology; c. 705 — Dunhuang Star Chart, a manuscript star chart from the Mogao Caves at Dunhuang
An online star chart; Monthly sky maps for every location on Earth Archived 2007-09-13 at the Wayback Machine; The Evening Sky Map – Free monthly star charts and calendar for northern hemisphere, southern hemisphere, and equatorial sky watchers. Sky Map Online – Free interactive star chart (showing over 1.2 million stars up to magnitude 12)
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.
The atlas includes three new (but now-obsolete) constellations invented by Jamieson: Noctua, Norma Nilotica, and Solarium. Two celestial hemispheres of the atlas are centered on the equatorial poles via polar projection and geocentric alignment. [1] The atlas comprises stars visible only to the naked eye, making it less cluttered. [1]
The horizontal, or altitude-azimuth, system is based on the position of the observer on Earth, which revolves around its own axis once per sidereal day (23 hours, 56 minutes and 4.091 seconds) in relation to the star background. The positioning of a celestial object by the horizontal system varies with time, but is a useful coordinate system ...
[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.
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