Forerunner of the sextant
Crossword Clue

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AnswerCrossword Clue
ASTROLABEForerunner of the sextant.
ASTROLABESextant forerunner
ASTROLABEPredecessor of the sextant.
astrolabea compact instrument used to observe and calculate the position of celestial bodies before the invention of the sextant
astrolabesASTROLABE, a compact instrument used to observe and calculate the position of celestial bodies before the invention of the sextant
verniersmall, movable, graduated scale running parallel to the fixed graduated scale of a sextant, theodolite, barometer, etc., and used for measuring a fractional part of one of the divisions of the fixed scale
vernierssmall, movable, graduated scale running parallel to the fixed graduated scale of a sextant, theodolite, barometer, etc., and used for measuring a fractional part of one of the divisions of the fixed scale
astrolabesAn instrument formerly used to make astronomical measurements, typically of the altitudes of celestial bodies, and in navigation for calculating latitude, before the development of the sextant. In its basic form (known from classical times), it consists of a disk with the edge marked in degrees and a pivoted pointer