Historical clue formulations

• Dividing line — 2017-11-22
• Where it's always zero degrees — 2014-07-23
• Where it never gets above zero degrees? — 2013-12-20
• It's just north of Nauru — 2008-05-10
• Line that extends for 24,902 miles — 2005-12-26
• Global divide — 2004-12-05
• Dividing line — 2003-12-27
• Big belt — 2001-09-09
• Middle name? — 1998-10-23
• 0 degrees — 1998-08-09