§Via Jeremy Crowson. A Minute of Arc is 1/60th of a degree. Because we just love having measurement systems which don't divide evenly by any number system. 1/60th of 360ths. Yeah. Gotta love that.
By coincidence a minute of arc is approximately one inch for every 100 yards.
There's also a metric unit called the MilRad.
When I was in the Terran Mobile Infantry we didn't use any sort of explosive projectile weapons at all: just rail guns and lasers. And because I'm such a wuss they mostly assigned me as android liaison officer.
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