But gigameters, terameters, petameters, etc. are not. That's what prefixes are for, and they continue to a range that could handle the universe. The AU is approximately 149.6 Gm, the parsec about 30.86 Pm.
>________________________________ > From: Eric L Shuman <[email protected]> >To: U.S. Metric Association <[email protected]> >Cc: U.S. Metric Association <[email protected]> >Sent: Friday, June 27, 2014 2:48 AM >Subject: [USMA:54068] Re: New supplement to the SI Brochure > > > >Because the numbers are beyond human comprehension. This part of my job >requires me to provide some meaningful sense of proportion. > > >Earth is 149 597 871 km from the Sun. That's our STARTING point. Meters, >kilometers, miles, furlongs, parasangs and stadia are totally meaningless on >the astronomical scale. > > > > > > >On 26 June 2014 17:45, Harold_Potsdamer <[email protected]> wrote: > >Why? Since the AU is fixed to the metre, why not just use the metre and its prefixes? >> >> >> >>From: Eric L Shuman >>Sent: Thursday, 2014-06-26 15:31 >>To: U.S. Metric Association >>Cc: U.S. Metric Association >>Subject: [USMA:54054] Re: New supplement to the SI Brochure >> >>Thanks for bringing this to my (our) attention! I use the astronomical unit in outreach work that I do, so this is good to be aware of. >> >> >> >> >>On 26 June 2014 07:36, James <[email protected]> wrote: >> >>Dear Folks, >>> >>>The BIPM has issued a supplement to the SI Brochure. It alters the order of the base units in defining derived units (Tables 6 and 7), it reflects the recent IAU decision to define the astronomical year as a fixed and exact number, and it makes some updates reflecting the latest CODATA, among other things. >>> >>>http://www.bipm.org/utils/common/pdf/si_supplement_2014.pdf >>> >>>Best regards, >>> >>>Jim Frysinger >>> >>>-- >>>James R. Frysinger >>>632 Stoney Point Mountain Road >>>Doyle TN 38559-3030 >>> >>>(C) 931.212.0267 >>>(H) 931.657.3107 >>>(F) 931.657.3108 >>> >>> >> > > >
