On Wed, 8 Apr 2009, Jonathan Bennett wrote:

>> You'd need a different projection since the disc is flat.  :)
>
> Coordinate system, surely?

That too.

North/south/east/west are replaced by hubwards, rimwards, turnwise and 
widdershins.  I guess that your coordinates would measure distance from 
the hub and angle around the hub from a standard datum.

  - Steve
    xmpp:[email protected]   sip:[email protected]   http://www.nexusuk.org/

      Servatis a periculum, servatis a maleficum - Whisper, Evanescence


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