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azimuth: the arc of the horizon between the meridian and the great circle passing through the zenith and an observed body.
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azimuth dial: sundial depending on measurement of horizontal angles, see article on the sundial.
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Babylonian hours: system of hour reckoning, see article on time and date.
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baseline: measured distance between two positions used as the observing stations for a triangulation survey; angles measured from this line serve to locate the other points in the survey.
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Butterfield dial: type of sundial adjustable for latitude, whose gnomon incorporates a latitude pointer often in the form of a bird. This dial type is associated with the 17th-century Paris-based English maker Michael Butterfield.
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