To get 1/1000 of any distance per hour, you have to be able to resolve time
to the 0.000277 seconds. However, fundamental metrology requires at least a
resolution of 1/10 to the right of the most significant digit to avoid
rounding errors. So timing resolution must be at least 0.000027 seconds.
The Bonneville clocks are better than that and report 7 seven places to the
right of the decimal!
From: Malcolm Pittwood <mbp01@sky.com>
(snip . . . ) "The calcualtion of the average speed . . . . " All to a
timed accuracy of 1/1000th of a second and then expressed to 1/1000th of a
mph or kilo per hour.
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