Newtonian telescope Newtonian telescope The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton's first reflecting telescope was completed in 1668 and is the earliest known functional reflecting telescope. The Newtonian telescope's simple design makes it very popular with amateur telescope makers. Newton's idea for a reflecting telescope was not new. Galileo Galilei and Giovanni Francesco Sagredo had discussed using a mirror as the image forming objective soon after the invention of the
Jose the Galilean Jose the Galilean Jose the Galilean (, Rabbi Yose HaGelili), d. 15 Av, was a Jewish sage who lived in the 1st and 2nd centuries CE. He was one of the Tannaim, the rabbis whose work was compiled in the Mishna. Jose was a contemporary and colleague of Rabbis Akiva, Tarfon, and Eleazar ben Azariah. Neither the name of his father nor the circumstances of his youth are known, though his name ("HaGelili") indicates that he was a native of Galilee. He suffered from the prejudice commonly held against the Galileans by the Judeans; on one occasion a woman who