Here's an interesting measurement of long-distance cycling achievement, credited to British astrophysicist Arther Stanley Eddington. Eddington defined the "Eddington number", represented asE. The most concise way to state the definition is:

A cyclist has an Eddington number ofEif (s)he has cycled at leastEmiles onEdifferent days.~~and has never cycled more than~~* You count the highest value ofEmiles on any other day.Efor which this is true--i.e., if you have done 65 rides of at least 65 miles, but not 66 rides of 66 miles, yourEis 65.

Here's another definition from Wikipedia:

http://en.wikipedia.org/wiki/Arthur_Stanley_Eddington

"Eddington number (cycling)

Eddington is credited with devising a measure of a cyclist's long distance riding achievements. The Eddington Number in this context is defined as E, the number of days a cyclist has cycled more than E miles[5][6]. For example an Eddington Number of 70 would imply that a cyclist has cycled more than 70 miles in a day on 70 occasions. Achieving a high Eddington number is difficult since moving from, say, 70 to 75 will probably require more than five new long distance rides since any rides shorter than 75 miles will no longer be included in the reckoning."

For example, reaching E=100 would require riding 100 centuries sometime during your life--and any century ride where you stop atexactly100 miles wouldn't be part of the 101 rides of 101 miles needed to reach E=101. Eddington reportedly reached E=87 by the time of his death in 1944, at the age of 61.

I haven't robustly kept track of my ride totals, but I'd suspect I might be somewhere around E=30 (I've done a couple of centuries, and once followed a 200k brevet route to see how it would go, but not too many of my rec rides go a whole lot beyond 50 km)

So, what do you think?

Any guesses at your Eddington number? (I'd call anything up to 24 hours a single "day"; anything longer than that would count as a two or more consecutive days.)

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*Footnote for academic types:

I ripped this definition from Jorge Hirsch's description of the "h-parameter" (quoted on Wikipedia), which he proposed (in 2005) as a measurement of the productivity and scientific impact of scientists.

This is identical to Eddington's definition ofOriginally Posted byJorge HirschE, and came more than 60 years after Eddington's death.