Newtonian telescope [SEP] named after
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.
History.
Newton's idea for a reflecting telescope was not new. Galileo Galilei and Giovanni Francesco
developed ways to make precision aspheric and parabolic objective mirrors for reflecting telescopes. In 1721 he showed the first parabolic Newtonian telescope to the Royal Society. This Newtonian, with a primary mirror, compared favorably with the large aerial refracting telescopes of the day. He also made Gregorian telescopes with accurately shaped mirrors.
Honors.
Mons Hadley and Rima Hadley on the Moon are named after him. 
The Oasis Trust Academy in Ponders End is called Oasis Academy Hadley in his honour.
See also.
- List of