Tycho Brahe's Astronomical Observations

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Across
  1. 3. Measuring distance using angles and known points
  2. 4. Buildings used for watching celestial events
  3. 7. A scientist who studies stars and planets
Down
  1. 1. The movement of planets around a star
  2. 2. Detailed watching and recording of space phenomena
  3. 5. Instruments for measuring angles between objects
  4. 6. Instruments for measuring angles in astronomy