Dear Jim and All,
Thanks Jim. I have added these rules of thumb to my collection.
Cheers,
Pat Naughtin
CAMS - Certified Advanced Metrication Specialist
- United States Metric Association
ASM - Accredited Speaking Member
- National Speakers Association of Australia
Member, International Federation for Professional Speakers
--
on 2002/03/05 10.47, James Frysinger at [EMAIL PROTECTED] wrote:
<snip>
> Here are some handy metric thumb rules for you. The Earth is 150 Gm from the
> Sun and 1 Gm = 1 000 000 km. The Earth's circumference is 40 000 km. The
> Earth travels at 30 km/s around the Sun and the Moon travels at 1 km/s around
> the Earth. Most "shooting stars" are traveling at 40 to 60 km/s when they hit
> our atmosphere to cause that quick streak of light. And light travels through
> spacd at 300 Mm/s or 300 000 km/s. The nice thing about all of this is that I
> used only two units, the meter and the second. All the rest was dealt with
> with prefixes, which do the same thing to any other unit they are attached
> to. No new unit names are needed when going from small to big sizes, as are
> needed with our series inch, foot, yard, fathom, pole, furlong, mile, and
> league; the meter and the standard prefixes handle all that and more.
>
> Jim
