Telescope earliest existing record of a telescope was a 1608 patent submitted to the government in the Netherlands by Middelburg spectacle maker Hans Lippershey for a refracting telescope. The actual inventor is unknown but word of it spread through Europe. [[Galileo Galilei|Galileo]] heard about it and, in 1609, built his own version, and made his telescopic observations of celestial objects. The idea that the [[Objective (optics)|objective]], or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope. The potential advantages of using [[parabolic reflector|parabolic mirrors]]—reduction of [[spherical aberration]] and no
Hans Jacob Grøgaard Hans Jacob Grøgaard Hans Jacob Grøgaard (5 April 1764 – 22 March 1836) was a Norwegian parish priest and writer. He served as a representative at the Norwegian Constituent Assembly in 1814. Hans Jacob Grøgaard was born in Åsnes in Hedmark, Norway. At age three, the family moved to Bergen, where his father was sexton at St. Jørgen's Hospital Church ("St. Jørgen hospitalkirke"). Grøgaard started his education at the Bergen Cathedral School. He studied theology in Copenhagen and earned his theological degree in 1784. In 1797, he became a chaplain at Øyestad Church in Aust-Agder. In 1811, he became vicar