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Edmond Halley Biography (SEDS) Edmond Halley's 1716 paper describing how transits could be used to measure the Sun's distance, translated from Latin. A Halley Odyssey; The National Portrait Gallery (London) has several portraits of Halley: Search the collection Archived 19 December 2006 at the Wayback Machine; Halley, Edmond, An Estimate of the ...
Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, [16] appearing every 72–80 years, [17] though with the majority of recorded apparations (25 of 30) occurring after 75–77 years.
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Halley's Comet, Comet Halley: Orbital characteristics; Epoch: 2449400.5 (17 February 1994) Number of observations: 7,428: Aphelion: 35.0823 AU: Perihelion: 0.585978 AU
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Edmond Halley, due to the lack of an assistant and only one vertical wire in his transit, confined himself to the use of a mural quadrant built by George Graham after its erection in 1725 at the Royal Observatory, Greenwich. Bradley's first observation with that quadrant was made on 15 June 1742. [1]
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