Re: OT: Converting miles/km

On 20/09/24 19:30, Helmut Richter wrote:

I like much more those thumb rules that actually allow you to estimate orders
of magnitude, e.g.:
>
1 year ≅ π · 10⁷ sec ≅ 31415926.54 sec
>
or
>
1 year ≅ √10 · 10⁷ sec ≅ 31622776.60 sec
>
or, only for those wanting more precision, the arithmetic mean of the two
which has three leading digits correct.

The one non-metric measurement that I find useful is "one foot per nanosecond".
--
Peter Moylan       peter@pmoylan.org    http://www.pmoylan.org
Newcastle, NSW