there's also the microcentury, john von neumann's maximum length of a good lecture (52 min 35.7 sec). it's too bad this hard limit is ignored so often. On Fri, Mar 22, 2019 at 10:21 AM Adam P. Goucher <apgoucher@gmx.com> wrote:
In the same vein: If you take a circle whose diameter is one of Grace Hopper's nanoseconds, then its circumference would be an approximate attocentury.
(The convention c = 1 is liberally assumed throughout.)
-- APG.
Sent: Friday, March 22, 2019 at 5:00 PM From: "Hans Havermann" <gladhobo@bell.net> To: math-fun <math-fun@mailman.xmission.com> Subject: Re: [math-fun] Pi s ~= nanocentury
TD: "...apparently the term [nanocentury] originated at IBM in the 1960s. It's hard to believe that I'm the first to notice that pi seconds is roughly the same thing..."
A Google books search finds a Proceedings, IBM Scientific Computing Symposium on Computers in Chemistry (1969) that has on page 92 a footnote: "A nanocentury is 3.15576 seconds."
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