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I think Leigh and I are saying the same thing and we are just using
different words to say it. Leigh says there is a gyrocompass fixed to the
stars, plus there are "reaction wheels" acting as "reservoirs" for angular
momentum.
The different thing I said was to label the "reaction wheels" as another set
of gyros. I described two sets of "gyros," one gimbaled for maintaining a
position reference, and another larger set not gimbaled for use as an
angular mometum reservoir.