Historical clue formulations

• Orbit — 2021-02-16
• Group of friends — 2016-01-17
• Perfect orbit — 2015-05-31
• Club — 2014-06-11
• Club — 2013-10-09
• Club — 2012-07-12
• Group — 2007-12-23
• There's simply no end to it — 2006-04-02
• Gang — 2004-02-21
• Club — 1994-11-26