SpaceX plans to launch a pair of long-delayed navigation satellites this evening at 8:34PM from Pad 39A at Kennedy Space Center.  Should conditions force a scrub, the next backup opportunity is on Sunday, April 28 at 8:30 PM EDT.

The satellites, FM25 and FM27, are being launched aboard a Falcon 9 booster as part of Europe’s MEO Galileo constellation. They will join twenty-six other satellites that began launching in 2011 to form part of a high-precision navigation system for the European Union.