Christiaan Huygens

Christiaan Huygens, Lord of Zeelhem, ( HY-gənz, US also HOY-gənz, Dutch: [ˈkrɪstijaːn ˈɦœyɣə(n)s] (listen); also spelled Huyghens; Latin: Hugenius; 14 April 1629 – 8 July 1695) was a Dutch mathematician, physicist, engineer, astronomer, and inventor who is regarded a central figure in the Scientific Revolution.

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Christiaan Huygens was one of the first astronomers to apply mathematical principles to the design of optics rather than trial and error, and his telescope could study Saturn's ring system. The Huygenian eyepiece he invented in the 17th century is still in use today