English Explanatory Dictionary

Gregorian telescope

English dictionary entry

Meanings

noun
  1. A type of reflecting telescope having two concave mirrors: the primary mirror (a paraboloid) collects the light and brings it to a focus before the secondary mirror (a ellipsoid), where it is reflected back through a hole in the centre of the primary, and thence out the bottom end of the instrument, where it can be viewed with the aid of the eyepiece.

Word forms

Gregorian telescope Gregorian telescopes

Etymology

Designed by Scottish mathematician and astronomer James Gregory in the 17th century.

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