> Was it this Tycho that has the large crater on the moon named > after him? Sure, it is.
Tycho designed many instruments and was the first to do very accurate astronomical observations. His observations of the motion of the planets were used by Kepler to formulate his famous three laws. The most famous of the three Kepler laws is the one that says that all the planets, moons and every other orbiting body has an elliptic orbit. Considering that the first telescope was invented by Galileo 8 years after Tycho Brahe's death, it's really astonishing what he was able to do with just sextants, quadrants and other similar simple instruments. Francesco
