Newtonian telescope secondary mirror. This design reduces the size and cost of the telescope with a shorter overall telescope tube length (with the corrector extending the focal length in a "telephoto" type layout) combined with a less costly spherical mirror. Commercially produced versions of this design have been noted to be optically compromised due to the difficulty of producing a correctly shaped sub-aperture corrector in a telescope targeted at the inexpensive end of the telescope market. 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
Galilean faith Galilean faith The Galilean faith (or "Galilaean faith") is a term used by some people of the ancient world (most notably emperor Julian) to designate Christianity. The town of Nazareth (the place of Jesus' childhood) is located in Galilee. Christ's followers were thus called "Galileans". Galilee was part of the province of Judea. The reason for this term was to marginalize Christianity and to indicate that it came from a small area, a religion of only local significance. In the same manner, Jesus was called "of Nazareth" or "the Nazarene" in this context (another emphasis on geographical origin and the