Tycho's instruments

Remarkably, one of the greatest observers in the history of astronomy worked without the benefit of telescopes — they had yet to be invented. As a young man, Tycho realized that the best tables predicting the times of celestial events such as planetary conjunctions were out of sync with his own meticulous observations. Tycho worked tirelessly planning and overseeing the construction of ever better instruments to measure the positions of stars and planets. Here are some links to websites th...