Editing Sungrazing comet (section)

=== Pre-19th century ===
One of the first comets to have its orbit computed was the sungrazing comet (and Great Comet) of 1680, now designated [[C/1680 V1]].  It was observed by [[Isaac Newton]] and he published the orbit results in 1687.<ref name=Marsden>{{cite journal|last=Marsden|first=Brian G.|title=Sungrazing Comets|journal=Annual Review of Astronomy & Astrophysics|date=September 2005|volume=43|issue=1|pages=75–102|doi=10.1146/annurev.astro.43.072103.150554|bibcode=2005ARA&A..43...75M}}</ref> Later, in 1699, [[Jacques Cassini]] proposed that comets could have relatively short orbital periods and that C/1680 V1 was the same as a comet observed by [[Tycho Brahe]] in 1577, but in 1705 [[Edmond Halley]] determined that the difference between the perihelion distances of the two comets was too great for them to be the same object.<ref>{{cite journal|last=Cassini|first=JD|journal=Hist. Acad. R. Sci. Paris|date=1699|volume=Amsterdam ed. 1734|pages=95–100}}</ref><ref>{{cite journal|last=Halley|first=Edmund|journal=Phil. Trans.|date=1705|volume=24|issue=297|pages=1882–1899|doi=10.1098/rstl.1704.0064|title=IV. Astronomiæ cometicæ synopsis, Autore Edmundo Halleio apud Oxonienses Geometriæ Professore Saviliano, & Reg. Soc. S|doi-access=free|bibcode=1704RSPT...24.1882H}}</ref> However, this marked the first time that it was hypothesized that Great Comets were related or perhaps the same comet. Later, [[Johann Franz Encke]] computed the orbit of C/1680 V1 and found a period of approximately 9000 years, leading him to conclude that Cassini's theory of short period sungrazers was flawed. C/1680 V1 had the smallest measured perihelion distance until the observation in 1826 of comet C/1826 U1.<ref name=Marsden />