An Atlas 5 rocket has a launch window of 5:38 to 5:56 p.m. EDT. Watch the launch live! This is putting a new satellite into the GPS constellation.
Spaceflight Now | Atlas Launch Report | Mission Status Center

Welcome to Spaceflight Now’s live coverage of the Atlas 5 rocket launching the latest GPS replacement spacecraft. Text updates will appear automatically; there is no need to reload the page. Follow us on Twitter.

via Facebook