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 away at the end of his trial he stamped his foot on the ground and muttered: "E pur si muove!" (And yet it does move!)

Kepler is another well-known astronomer, of whom we shall hear again. These three are all more eminent men than Tycho Brahe, whose fame does not depend on any startling discovery, but on the fact that he devised wonderful instruments, and by unceasing energy and industry collected a mass of material which was of untold value to his successors. But perhaps most of all it is his romantic life and his strong character which make him stand out in history.

Tycho was born in 1546 and was the eldest of ten children. His father, Otto Brahe, was lord of Knudstrup in Scaane, which now forms part of Sweden. At an early age he was adopted by his uncle, Jorgen Brahe, who treated him as if he were his son, had him educated at Copenhagen, but by spoiling him a good deal was no doubt responsible for the somewhat conceited and domineering manner he developed in later years. At the age of fourteen Tycho received what might be termed his "call" from the heavens. It came in the form of an eclipse of the sun, which roused the boy's interest to such an extent that from that moment he made up his mind to turn his attention to astronomy. It is a curious fact that ten years later, when chemistry had so absorbed him that he had almost abandoned his astronomical studies, he again received a sign from the heavens. This time