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back staves

 - 1 dictionary result

back staff

–noun
an obsolete instrument for determining the altitude of the sun by facing away from the sun, sighting upon the horizon, adjusting a cursor until its shadow falls upon the sight through which the horizon appears, and measuring the resulting arc.

Origin:
1620–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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