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From: Peter Moylan <peter@pmoylan.org>
Newsgroups: sci.lang,alt.usage.english
Subject: Re: OT: Converting miles/km
Date: Fri, 20 Sep 2024 20:55:41 +1000
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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