bert -- the "approximately" was meant sort of ironically (12 significant figures and all). but really it is only approximate. c = 299,792,458 meters/second. which is 186,282.4 miles/sec. or, to be more precise, 186,282.397... miles/sec, depending on how precisely we convert meters to miles. i figured doing it to one decimal place was close enough, given all those numbers, but it's still an approximation. michael
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