# Eddington Numbers

This all started in 2008 when, following a comment I made about having done one hundred 100 mile rides the previous year, a club mate told me that was an “Eddington Number”. The idea came from Arthur Eddington who was a keen cyclist and wanted a measure of a cyclists achievements:

*“The Eddington number in the context of cycling is defined as the maximum number E such that the cyclist has cycled E miles on E days.”*

What really appealed is how the effort to advance the number accelerates. I also realised the idea could be applied to all aspects of Triathlon. So each sport as well as totals for the day. Also for not only your lifetime but what is achieved in a single year. Then rather than looking at amount done in a day you can look at whats done in a week or month. Then it’s not just limited to Miles… anything can be done – KM, Watts, Heart Rate, TSS are just some that I have done. To track them all I need to place my data in a database at which point tracking them became easy. This page and the sub pages show most of the numbers I track.

**Notation**

I calculate how many of the number above I need to advance my Eddington Number by one. I use the notation left in the tables.

Main Number – current Eddington Number

Red number – how many ‘rides’ of the next Eddington Number required to increase it by one

So this number tells me that I need to do 9 rides of at least 131 to increase the number to 131.

Swim — Bike — Run — Total — Other

The links above are to detailed listings of my Eddington numbers through the history of my training diary. Below is a summary giving the current LTD figure together with a prototype maturity measure (which I’m still working on).

*Updated 17th August 2017*

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