Astronomical Dictionary
Letter: H


Dictionary of Astronomical Definitions and Terms.
Astronomical | H

 

Definition


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Heliocentric
Sun-centered. Positions of planets, including the Earth and Moon, referred to the center of the Sun. It is normal to give the Geometric Positions, i.e., positions not corrected for light-time.
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Hadley
John Hadley (1682-1744) English mathematician and inventor. Built first serviceable reflecting telescope and invented an improved quadrant known as Hadley's quadrant.
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Halley
Edmond Halley (1656-1742) English astronomer. In 1758, predicted accurately the return of a comet previously observed in 1531, 1607, 1682. The body was subsequently named Halley's Comet.
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Herschel
Sir William Herschel (1738-1822). British astronomer. Built reflecting telescope of superior quality and with it discovered planet Uranus . Discovered satellites of Uranus and of Saturn.
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Hestia
In Greek mythology, one of the twelve Olympian gods. Sister of Zeus and goddess of the hearth and home (Roman name, Vesta).
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Hubble
Edwin Powell Hubble (1889-1953) American astronomer known for seminal work in modern cosmology.
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Hummocky
Uneven; describing a terrain abounding in irregular knolls, mounds, or other small elevations.
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Hyperion
In Greek mythology, a Titan, son of Uranus and Gaea. Husband of Theia and father of Eos (the Dawn). A handsome wanderer, his name is said to signify height or superiority.
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