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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
Navigators often use star charts to identify a star by its position relative to other stars. References like the Nautical Almanac and The American Practical Navigator provide four star charts, covering different portions of the celestial sphere. Two of these charts are azimuthal equidistant projections of the north and south poles. The other ...
Star system ← ← Median distance () Stars in system Spectral type Apparent magnitude (V) Comments and references Zeta Ophiuchi: 440 ± 40: 1: O9.5 V: 2.56 – 2.58
The scope of the list is still restricted to the main sequence spectral types: M, K, F, G, A, B and O. It may be later expanded to other types, such as S , D or C . The Alpha Centauri star system is the closest star system to the Sun .
System ← → ← → Star or (sub-) brown dwarf Distance ()Constellation Coordinates: RA, Dec (Ep J2000, Eq J2000)Stellar class Apparent magnitude (V) Parallax (Notes and additional references
A simple chart for classifying the main star types using Harvard classification In astronomy , stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors ...
A science fair or engineering fair is an event hosted by a school that offers students the opportunity to experience the practices of science and engineering for themselves. In the United States, the Next Generation Science Standards makes experiencing the practices of science and engineering one of the three pillars of science education.
This is a list of star systems within 150–200 light years of Earth. [1] [2] [3] This list is incomplete; you can help by adding missing items. (July 2024)