I have found the guidance provided by the International Astronomical Union. It is found at http://www.iau.org/units.html and it clearly prefers the use of SI units. There is a short list of units which the IAU also recognizes. Unfortunately, these include the parsec, the solar mass, and the jansky. Fortunately, the guidance explicitly deprecates the cgs units still in common use by American astronomers. Maybe I'll post this on my office wall! ;-) Jim -- Metric Methods(SM) "Don't be late to metricate!" James R. Frysinger, CAMS http://www.metricmethods.com/ 10 Captiva Row e-mail: [EMAIL PROTECTED] Charleston, SC 29407 phone/FAX: 843.225.6789
