But the daytime launch at 11:05 a.m. from Vandenberg Air Force Base is unlikely to create a sky show over San Diego.
A nighttime launch of the 233-foot rocket — the second most powerful in use after the SpaceX Falcon Heavy — was delayed five times in December. In one case the countdown was halted just 7.5 seconds before liftoff.
The secret NROL-71 mission is being carried out by United Launch Alliance, a joint venture of Lockheed Martin and Boeing.
Launches from Vandenberg after sundown typically create impressive aerial light shows over much of Southern California.
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