. . "Nicholas Kratzer"@en . . . . "Kratzer, Nicholas"@en . "1487Z"^^ . . . "1550Z"^^ . . . . . "Nicholas Kratzer (1487? \u2013 1550) was a German mathematician, astronomer, and horologist. Much of Kratzer's professional life was spent in England, where he was appointed as astronomer to King Henry VIII."@en . . "German astronomer" .