I used to love watching shuttle launches, and they would sometimes delay missions a day or two due to weather, even if the rain/snow would be over in a few hours. Why couldn’t they just wait instead of delaying?
A launch window implies that the vehicle needs to rendezvous with another object that is orbiting, such as a space station or the Moon. Those objects are also in motion, so you need to time the launch right to intercept their paths.
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