>How about a 2-sided Mirror on the clock mechanism
>reflecting the beam from a stationary laser, so it
>gives a 180 deg sweep for each 12 hour period
>(clock mech driven at half speed to give 1 rotation
>every 24 hrs)

hey we do that on our space craft instrument to scan the earth each rotation
of the craft.

Next one being launched tonight 22:33GMT. Details at
http://www.sstd.rl.ac.uk/ under "launches and events" "MSG2".

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