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Apologetica responsio ad Craigum Scotum de cometis / Apologetic response to the Scot John Craig on comets (1589) by Tycho Brahe Calculi de obliquitate eclipticæ / Calculations of the obliquity of the ecliptic (1600) by Tycho Brahe De disciplinis mathematicis oratio / Oration on the mathematical sciences (1574) by Tycho Brahe Fratri gemello / Poem to his stillborn twin-brother (1572) by Tycho Brahe