The specific period of time during which a rocket can launch to meet its mission objectives — usually constrained by orbital mechanics (target orbital plane alignment with Earth's rotation), illumination conditions, weather, range safety, and downrange recovery logistics. ISS-rendezvous missions typically have instantaneous launch windows (zero margin) while GEO insertions may have multi-hour windows.
In LaunchDetect
LaunchDetect's /next-launch/ page tracks the soonest scheduled launch window across all operators worldwide. LaunchDetect confirms ignition independently of the announced window.