Historical clue formulations

• Rarely photographed half of the moon — 2012-08-05
• Unseen part of the moon — 2008-07-13
• The moon has one — 2008-02-09
• Comic collected in "The Chickens Are Restless," with "The" — 2006-12-01
• Gary Larson comic, with "The" — 2005-06-27
• Unseen area of the moon — 2003-12-07
• Gary Larson strip, with "The" — 2003-05-08
• Unseen part of the moon — 2001-12-28
• Gary Larson cartoon, with "The" — 1995-08-15