Are there references to the use of sundials in navigation?
In the days before magnetic variation was mapped, they must have been useful
(with the limitations of stability that a dial on board a ship would have.)
No doubt travellers on land used them, are there special types that
developed for this purpose?
>Also, does anyone know how accurately these dials are at orienting to
>north? They seem to have the advantage that they don't have to be
>adjusted for magnetic declination and that they aren't affected by
>other magnetic fields. (And of course the obvious disadvantage that
>they must have sun in order to work.) So, they seem like they would
>be a great companion to a compass.
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Peter Abrahams [EMAIL PROTECTED]
the history of the telescope, the microscope,
and the prism binocular
