| Abstract from DBPedia | The Gregorian telescope is a type of reflecting telescope designed by Scottish mathematician and astronomer James Gregory in the 17th century, and first built in 1673 by Robert Hooke. James Gregory was a contemporary of Isaac Newton. Both often worked simultaneously on similar projects. Gregory's design was published in 1663 and pre-dates the first practical reflecting telescope, the Newtonian telescope, built by Sir Isaac Newton in 1668. However, Gregory's design was only a theoretical description, and he never actually constructed the telescope. It was not successfully built until five years after Newton's first reflecting telescope.グレゴリー式望遠鏡（グレゴリーしきぼうえんきょう、Gregorian telescope ）は、ジェームス・グレゴリーにより考案された反射望遠鏡の一形式である。 (Source: http://dbpedia.org/resource/Gregorian_telescope) |
