SpaceX Launch Postponed

An anonymous reader writes with news about SpaceX's launch today and second attempt to land its Falcon 9 rocket on a platform floating offshore in the Atlantic ocean. "You can watch live as SpaceX launches its Falcon 9 rocket and attempts to recover the first stage portion via an automated, barge-based landing plan in the Atlantic ocean, with the first take-off attempted scheduled for 4:33 PM ET, provided conditions remain good and pre-flight checks go well. A big part of this mission, designated CRS-6 and designed primarily as a resupply flight for the International Space Station, is getting a second chance at recovering Falcon 9's first stage rocket. Once the second stage and the Dragon spacecraft detach from that first stage rocket, it'll undergo a controlled descent as it attempts to touch down with SpaceX's ocean-borne landing platform." Update: 04/13 21:43 GMT by S : The launch was scrubbed because of lightning in a nearby cloud. It's been rescheduled for tomorrow at 4:10PM ET.

Comments

Why a one-second launch window?

[gman003]

I've seen short launch windows before, but not for ISS-bound launches. I remember previous Dragon launches having significantly longer windows to launch. Am I remembering wrong, or is there something about this launch that requires a shorter window?