The day is the natural unit of time, encoded into all life on the surface of the earth. Therefore the light day ought to be the natural unit of length.
1 light day = 25902068371200 meter (exactly)
1 light day = 173.14463 AU (astronomical unit)
1 meter = 38.606955 femto light day
1 femtolightday = 1.0197665 inch
1 light nanosecond = 11.574074 femto light day
1 attoparsec = 1.1912862 femto light day
1 parsec = 1.1912862 kilo light day
1 light year = 365.25 light day (exactly) (NB: the "units" program gives an incorrect value for "light year" with a space but the correct value for "lightyear" or "ly" without a space.)
Unfortunately the length of the day, the day-night cycle encoded into life, changes as the Earth's rotation slows down (causing leap seconds).
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