400 years of astrometry: from Tycho Brahe to Hipparcos

  title={400 years of astrometry: from Tycho Brahe to Hipparcos},
  author={Erik H{\o}g},
  journal={Experimental Astronomy},
  • E. Høg
  • Published 24 March 2009
  • Physics
  • Experimental Astronomy
Galileo Galilei’s use of the newly invented telescope for astronomical observation resulted immediately in epochal discoveries about the physical nature of celestial bodies, but the advantage for astrometry came much later. The quadrant and sextant were pre-telescopic instruments for measurement of large angles between stars, improved by Tycho Brahe in the years 1570–1590. Fitted with telescopic sights after 1660, such instruments were quite successful, especially in the hands of John Flamsteed… 

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