Historical clue formulations

• Marks of a ruler — 2021-01-07
• " — 2017-01-28
• Moves slowly — 2014-03-02
• " — 2011-10-13
• Precipitation prediction — 2011-10-09
• What some races are won by — 2009-07-29
• Rainfall units — 2009-05-11
• " — 2008-04-01
• Ruling units — 2004-05-14
• Rulers have them — 2000-04-01
• Foot parts — 1996-05-26
• Moves at a snail's pace — 1994-11-17