They don't really have a choice. The launch window is small and they either make it or they don't.
replyThere is a window on the 2nd. But you don't aim for the second half of the launch period and hope you make it, you aim for the start to allow time to resolve issues without waiting for the next window (which is the end of the month).
replyWhat factors are there for the lunar launch window?
replyIt can't be weather, here, right? That's too far ahead.
Is it perigee?
If this window is missed, when is the next one?
The position of the moon relative to the earth and the sun. The windows are about a month apart.
replyWell at least there’s a 50% probability of success
reply"April fools, your space shuttle just disintegrated!"
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