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Should switch the foot to a light-nanosecond so all those quick engineering estimates could be the actual length.

Just because I needed to look it up:

- 1 International Foot = 0.3048 m

- 1 US Survey Foot = 1200/3937 m ~= 0.3048006096 m

- 1 light-nanosecond ~= 0.2998 m