>
>I think if you do it this way then the date example should always work, as
>long as you feed it the correct data (i.e. november 1966 and january 2004
>wouldn't necesarily give a november average). It doesn't help the dearings
>example though.

There's the crux of the problem..

Time can be represented as a line, a spiral, or a circle, depending on your purpose.
Bearings can only be properly represented as a circle.

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