<P> 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 . </P>
<P> 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 . </P>
british architect physicist chemist and inventor who built the first gregorian telescope
british architect physicist chemist and inventor who built the first gregorian telescope
Robert Hooke
Robert Hooke