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Hace 10 horas · The Greek astronomer Hipparchus is credited with first using parallax to estimate the distance to the Moon and the Sun. In the 19th century, astronomers such as Friedrich Bessel and Thomas Henderson made significant advancements in measuring stellar parallax, laying the foundation for modern astronomical distance calculations.
Hace 10 horas · Alpha Centauri ( α Centauri, Alpha Cen, or α Cen) is a triple star system in the southern constellation of Centaurus. It consists of three stars: Rigil Kentaurus (Alpha Centauri A), Toliman (B) and Proxima Centauri (C). [13] Proxima Centauri is the closest star to the Sun at 4.2465 light-years (1.3020 pc ). Alpha Centauri A and B are Sun-like ...
Hace 10 horas · Countries named are where authors worked for long periods.; Subject codes: A (architecture), Aa (applied arts), Af (armed forces), Ag (agriculture), Ar (archaeology ...
