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
Galilean the members of a fanatical sect (Zealots), followers of Judas of Galilee, who fiercely resented the taxation of the Romans, and whose violence contributed to induce the Romans to vow the extermination of the whole Galilean race. "Galileans" was also term used by some in the Roman Empire to name the followers of Christianity, called in this context as the Galilaean faith. "Galilean", as an adjective, describes some aspects of mathematics or astronomy associated with Galileo: see for example Galilean moons and Galilean transformation. "Galileans" are also a fictional race of living planets in the "Ben 10" universe that possess