Historical clue formulations

• Hale telescope's home — 2015-10-10
• Hale telescope's observatory — 2012-08-15
• Mount ___, California observatory site — 2010-02-08
• Mount from which people can see far away — 2009-08-07
• California's ___ Observatory — 2006-05-12
• California observatory — 2005-11-05
• California observatory — 2005-08-23
• Home of the Hale telescope — 2000-12-07