On 2008 Mar 22 , at 7:34 PM, James Frysinger wrote:
Near enough for astronomical math, a light year is 10 Pm.
The more precise figure is 9.460 Pm. I agree that 10 Pm is a good approximate value. It's only off by about 6%. If a 6% error is too much in some situation, then using 9.5 Pm would reduce the error to about 0.4% which isn't bad.
