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652 On July 20, 1969, as Apollo 11 descended toward the Sea of Tranquility, Margaret Hamilton’s software survived five alarms in four minutes because her team had built a priority scheduler that shed lower-priority tasks instead of crashing

Silicon Canals
Silicon Canals Editorial Team @ Silicon Canals · 06/19/2026 04:39 EDT

On July 20, 1969, as Apollo 11 descended toward the Sea of Tranquility, Margaret Hamilton’s software survived five alarms in four minutes because her team had built a priority scheduler that shed lower-priority tasks instead of crashing

The Apollo Guidance Computer overloaded five times during Eagle's descent on July 20, 1969. Margaret Hamilton's team had built it to survive exactly that — and the priority scheduler they wrote is why Armstrong landed at all.

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