Artist's impression of Tycho on his way home on the night of 11 November 1572 observing an unfamiliar bright star in the constellation Cassiopeia. Engraving from Astronomie Populaire by Camille Flammarion (Paris, 1881). Tycho Brahe (Tyge Ottesen Brahe - 1546-1601) Danish astronomer, astrologer and alchemist who built astronomical instruments which enabled him to make the most accurate observations of his time.