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It is important to remember that Tycho Brahe lived before the invention of the telescope. Astronomical observation were made by the naked eye. Galilei invents the telescope 9 years after Tycho Brahe's death. The devices Tycho Brahe used and constructed are therefore mainly devices for measuring angles and positions. Also clocks were very limited at that time, the pendulum clock was not invented either, so to measure time, Tycho usually chose to use the movements of the stars and planets, with admirably accurate results.