Spaceflightnow reports on the next launch of the SpaceX Falcon 9 Rocket (11 hours from the time this story posts):
Falcon 9 • Iridium Next 51-55 & GRACE Follow-On
Launch time: 1947:58 GMT (3:47:58 p.m. EDT; 12:47:58 p.m. PDT)
Launch site: SLC-4E, Vandenberg Air Force Base, California
A SpaceX Falcon 9 rocket will launch five satellites for the Iridium next mobile communications fleet and two Gravity Recovery and Climate Experiment Follow-On (GRACE Follow-On) satellites for NASA and the German Research Centre for Geosciences (GFZ). The Falcon 9 rocket will launch with a previously-flown first stage.
As it usually does, SpaceX has a live feed page up on YouTube which also notes:
A backup instantaneous launch opportunity is available on Wednesday, May 23 at 12:42 p.m. PDT, or 19:42 UTC.
[...] SpaceX will not attempt to recover Falcon 9's first stage after launch.
(Score: 0) by Anonymous Coward on Tuesday May 22 2018, @04:04PM (2 children)
My physics prof explained that precise measurement of the Earth gravitational field is important for accurate placement of ICBMs allowing for smaller warheads to take out targets.
(Score: 2) by bob_super on Tuesday May 22 2018, @04:55PM
And for correction of GPS sat orbits, which help the warhead compensate for imprecision in inertial guidance systems.
(Score: 0) by Anonymous Coward on Tuesday May 22 2018, @05:08PM
It's used for much more than that.