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20 to 24 of 227 glossary terms
Babylonian hours: system of hour reckoning, see article on time and date.
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.
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.
calendar: system of reckoning dates, see article on time and date.
calendar-zodiac scale: scales relating the sun's position in the zodiac to the date.
