Back مقراب غريغوري Arabic Telescopi gregorià Catalan Gregoryho dalekohled Czech Gregory-Teleskop German Telescopio gregoriano Spanish تلسکوپ گریگوری Persian Télescope grégorien French Gregoryjev teleskop Croatian Telescopio gregoriano Italian グレゴリー式望遠鏡 Japanese
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, and 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.[1] 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.