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The astronomical unit (symbol: au, or AU) is a unit of length defined to be exactly equal to 149,597,870,700 m. Historically, the astronomical unit was conceived as the average Earth-Sun distance (the average of Earth's aphelion and perihelion ), before its modern redefinition in 2012.
The astronomical system of units, formerly called the IAU (1976) System of Astronomical Constants, is a system of measurement developed for use in astronomy. It was adopted by the International Astronomical Union (IAU) in 1976 via Resolution No. 1, and has been significantly updated in 1994 and 2009 (see Astronomical constant).
Astronomia, që nga etimologjia do të thotë " ligji i yjeve ", ( greq.: astro + nomos) është shkencë që përfshin vrojtimin dhe shpjegimin e dukurive që ndodhin jashtë Tokës dhe atmosferës së saj. Ajo studion prejardhjen, zhvillimin, vetitë fizike dhe kimike të të gjitha trupave jashtë tokësorë që mund të vrojtohen në qiell ...
astronomical unit (AU, or au), a unit of length effectively equal to the average, or mean, distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 miles). Alternately, it can be considered the length of the semimajor axis—i.e., the length of half of the maximum diameter—of Earth’s elliptical orbit around the Sun.
- The Editors of Encyclopaedia Britannica
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Astrofizika teorike është një disiplinë shkencore që studion gjithësinë me anë të modeleve teorike, simulimeve kompjuterike etj. Astrofizika teorike është e lidhur ngushtë me zhvillimet më të reja teorike dhe eksperimentale të fizikës, kimisë dhe matematikës po ashtu me vëzhgimet astronomike.
The astronomical unit ( AU) is a unit of length derived from the Earth's orbit. It is the average distance the Earth gets from the Sun on the long axis of the ellipse. Its definition is: the length of the semi-major axis of the Earth's elliptical orbit around the Sun. "Semi-major" means half the long axis.
The astronomical unit (abbreviated variously as AU, au, a.u. or ua) is a unit of length roughly equal to the mean distance of the Earth from the Sun. The currently accepted value of the AU is 1.49597870691 x 10 11 (± 3) meters (m), which is approximately 150 million kilometers (km) or 93 million miles.
