komet halley

Sir Isaac Newton discovered a method to calculate the orbit of a comet on a path that can be observed in space. Newton determined that the comet that appeared in December 1680 following the parabolic orbit very long. Edmund Halley, a scientist who lived contemporary with Newton discovered that the orbits of comets that had appeared in 1531, 1607, and 1682 is almost identical. This discovery led to the conclusion that all three of these sightings involve the same comet. He then predicted that the comet would appear again in the year 1758. Unfortunately, he was not long enough to be able to see the truth of that prediction. Comet sightings - later named Halley's comet - it has recorded as many as 20 times since 239 BC. The last appearance was in the year 1985-1986.

Newly discovered comet is usually named according to the invention years plus a letter indicating the order of appearance of the comet in the year when the comet was found. As the date when the comet reaches perihelion point can be known, the comet is soon named calendar year according to figures quoted at the time that Roman numerals indicate the chronological order of perihelion crossing in that year (eg, 1882 II). Some of the comet named after its inventor's name, such as Halley's comet; also Hale-Bopp comet named after two amateur astronomers who reported appearance in the same night in 1995.