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#On February 28, 1963, a thrust assisted Thor rocket was launched from pad 75-3-5 at Vandenburg Air Force Base in California carrying a Keyhole 4 military surveillance satellite. | #On February 28, 1963, a thrust assisted Thor rocket was launched from pad 75-3-5 at Vandenburg Air Force Base in California carrying a Keyhole 4 military surveillance satellite. | ||
#The rocket started to veer off course and was intentionally destroyed | #The rocket started to veer off course and was intentionally destroyed at an altitude of 44 kilometers (144,000 feet) at 1:52 pm. | ||
#The "cloud" appeared around sunset on February 28, 1963 and remained sunlit for 28 minutes after sunset. | #The "cloud" appeared around sunset on February 28, 1963 and remained sunlit for 28 minutes after sunset. | ||
#The "cloud" appeared near Flagstaff, AZ (referred to as the "Flagstaff Cloud" in this article). | #The "cloud" appeared near Flagstaff, AZ (referred to as the "Flagstaff Cloud" in this article). |