What is a launch window in spaceflight?
Quick Answer
A launch window is the specific time period when a rocket can launch to reach its target efficiently and safely. It depends on orbital alignment, weather, and mission constraints.
The Full Story
A launch window is chosen so that the spacecraft can depart at the right moment to meet its destination on schedule and with the correct trajectory. For planetary missions, the positions of Earth and the target planet matter enormously, because the route through space changes over time as both bodies move in their orbits. Weather, range safety, and the spaceport’s operational status can also affect the available window. Some launch windows last hours; others may open only on certain days every 13 months or so, depending on the mission.
Key Facts
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"Why rockets can’t just launch any day"