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From: Bruce Stark (no email)
Date: Thu Aug 12 2004 - 20:34:05 EDT
Robert,
In measuring altitudes above the sea horizon, you swing the sextant to sure
you've brought the sun, or whatever, down to that part of the horizon directly
under it. In other words, you are checking that that the measurement is in a
vertical plane, not slaunchways. Being vertical doesn't mean it's parallel to
the plane of the instrument.
Bruce
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