On Aug 21, 2006, at 2:45 PM, Gerhard Fiedler wrote:

> Use a real-time clock (with some tables or a formula)
> as sanity check for the position.
>
(uninformed opinions follow)

Use a real-time clock to determine position, and forget the
fancy and presumably (from what others are saying) error and
failure prone tracking sensors.  I'll bet you can find an
algorithm for determining sunrise and sunset time based on
date, and that should be all you need to get real close to
as good as you can get with actual tracking.  If you're doing
2-axis tracking, you can base the other axis on month.

BillW
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