Historical clue formulations

• 16th-century pioneer in astronomy — 2022-08-13
• Astronomer who lost part of his nose in a sword duel — 2022-03-31
• Kepler's contemporary and teacher — 2018-04-20
• Astronomer who coined the term "nova" — 2016-12-24
• Astronomer Tycho ___ — 2010-08-15
• Astronomer who lost part of his nose in a duel — 2010-01-24
• Danish astronomer who followed Copernicus — 2009-09-17
• Contemporary of Kepler — 2008-11-27
• Astronomer Tycho ___ — 2007-08-15
• Noted Danish astronomer — 2002-08-31
• Astronomer Tycho — 2002-03-15
• Astronomer Tycho — 1996-11-19
• Astronomer Tycho — 1994-07-17