+ octagon (eight) => cross-quarter ... Space Discovery... Discovery STS-121 Launch: July 04 , 2006 Landing: July 17 , 2006 In 2005... July 04 : Deep Impact collision with Comet Tempel 1. Discovery STS-114 (mission right before STS-121) landing: Time : ~August 9, '05 = Samhain cross-quarter day/window. Site : Edwards AFB