Excess light is, however, only one hazard of modern astronomical life.
The present value for the astronomical unit is 149,597,871 km (92,955,807 miles).
Dating back to 1726, the Jantar Mantar is an observatory with 19 fixed astronomical instruments.
In 136 chapters Gersonides reviews and criticizes astronomical theories of the day, compiles astronomical tables, and describes one of his astronomical inventions.
His editions pioneered the printing of astronomical diagrams and numerical tables.
One of the most accurate astronomical transit instruments in the world is the U.S.
Hale was a major driver in the establishment of the American Astronomical Society in 1899.
Astronomers used Greenwich Mean Astronomical Time (GMAT), in which the day begins at noon.
International Ultraviolet Explorer (IUE), astronomical research satellite built in the 1970s as a cooperative project of the U.S.
—died Jan. 27, 1860, Brisbane House), British soldier and astronomical observer for whom the city of Brisbane, Australia, is named.
As the world’s first astronomical journal, it was the central depot for astronomical research until it ended in 1813.
Ptolemy has a prominent place in the history of mathematics primarily because of the mathematical methods he applied to astronomical problems.
International Astronomical Union (IAU), senior body governing international professional astronomical activities worldwide, with headquarters in Paris.
The astronomical unit provides a convenient way to express and relate distances of objects in the solar system and to carry out various astronomical calculations.
Historically, astronomers used Greenwich Mean Astronomical Time (GMAT), in which the astronomical day began at noon at longitude (0°), in accord with scientific tradition.
His first major astronomical work, the Almagest, was completed about ad 150 and contains astronomical observations that Ptolemy had made over the preceding quarter of a century.
His first major astronomical work, the Almagest, was completed about 150 ce and contains reports of astronomical observations that Ptolemy had made over the preceding quarter of a century.
The reality of astronomical hypotheses—and hence the superiority of the Copernican world system—implied a physicalization of astronomical theories and, in turn, an accentuation of causality.
The American Astronomical Society issued a statement soon afterwards cautioning that mass launch of commercial satellites could adversely affect astronomical research, and astronomers quickly started to spot Starlink satellites leaving bright streaks across their readings.
On the night side, or the side away from the Sun, the forces associated with the magnetic field and the solar wind are parallel, and thus the magnetosphere extends a considerable distance, possibly even several astronomical units (one astronomical unit is the average distance between the Earth and the Sun, about 1.5 × 108 km).
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On the night side or the side away from the Sun the forces associated with the magnetic field and the solar wind are parallel and thus the magnetosphere extends a considerable distance possibly even several astronomical units one astronomical unit is the average distance between the Earth and the Sun about 15 × 108 km