and have scrubbed tonight's launch due to a problem with an oxygen relief valve on the second stage.

From : Now targeting no earlier than (NET) Friday May 10 for another Crewed Test Flight.

No time given in the blog post. For flights, they move up roughly 23 minutes each day due to orbital mechanics, so if last night was targeting 10:34 PM EDT, figure Friday will be around 9:00 PM EDT (a more civil hour).

blogs.nasa.gov/boeing-crew-fli

Warning, boring orbital mechanics screed ...

orbits Earth at 51° to the equator so it can pass over both and Baikonur.

If you attend a night launch, you'll see ISS pass over KSC just before so the crew vehicle is on the same trajectory.

ISS orbits Earth once every 90 minutes, 18 times a day. But Earth is rotating too, so the upshot is that ISS passes over KSC about once a day minus 22-23 minutes.

You can see ISS pass over KSC in this video at the 5:20 mark.

youtu.be/w08NsKwplt8

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You might think that Shuttle (in that video) or any other crewed vehicle is going to try to catch up to , but that's not quite how it works.

ISS-bound vehicles typically launch to an altitude slightly higher than the station's orbit, then begin a dance slowly falling back to Earth to intercept the ISS orbit. It's easier than trying to chase the station.

Orbital mechanics can be mind-bending.

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