ukma.org.uk

1amjr TIL: The Apollo Guidance computer was programmed in metric, but showed imperial values in the displays. Using metric meant fewer calculations thus optimizing the use of the limited processing power and the astronauts were used to imperial so that's what they saw on the display.
QJBwd TIL the computers on the Lunar Modules used for the Apollo moon landings used SI (metric) units for their calculations and converted them to Imperial units for the astronauts to read on their instrumentation panels.