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Astronomical Telescope (Refractor Era)

Type Object Region Europe Time 1660–1670

Refracting astronomical telescopes widely used in European observatories in the mid-17th century;…

Timeline

  1. 1661–1665Danzig · PomeraniaHevelius built refracting telescopes in Danzig with focal lengths of tens to over a hundred feet, precisely mapping the lunar surface and comet orbits, demonstrating the refractor era's pursuit of the limits of observational precision.
  2. 1666–1670Paris · Île-de-FranceUsing an improved refracting telescope, Huygens discovered Titan and resolved the structure of Saturn's rings, bringing refractor performance to new heights, while chromatic aberration prompted researchers to explore reflecting telescope alternatives.

Sources