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• Maksutov telescope — A 150mm aperture Maksutov Cassegrain telescope. The Maksutov is a catadioptric telescope design that combines a spherical mirror with a weakly negative meniscus lens in a design that takes advantage of all the surfaces being nearly spherically… …   Wikipedia

• Catadioptric system — A 150 mm aperture catadioptric telescope (Maksutov) A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics). Catadioptric… …   Wikipedia

• Citroën DS — Manufacturer Citroën Also called Citroën ID Production 1955–1975 Assembly …   Wikipedia

• General Councils —     General Councils     † Catholic Encyclopedia ► General Councils     This subject will be treated under the following heads:     ♦ Definition     ♦ Classification     ♦ Historical Sketch     ♦ The Pope and General Councils     ♦ Composition of …   Catholic encyclopedia