arcdegree, degree

celestial navigation, compass, theodolite, astrolabe, spyglass, armillary sphere, sundials, protractor, caravel, echo sounder, navigators, magnetic compass, lightship, gnomon, chronometer, wind vane, mariner, capstan, nautical, sunstone, hipparchus, altimeters, longitude, global positioning system, yardarm, oarlocks, gyrocompass, adze, surfman, bathyscaphe, lighthouse, plumb bob, dowsing rod, spectroscope, periscopes, celestial sphere, breeches buoy, planchette, weather vane, scow, logarithms, yantra, eggbeater, centerboard, anemometer, philae, inertial guidance, trigonometry, windsock, quill pen, mainmast, camera obscura, halyards, treadle, voltmeter, binnacle, astrometry, buoys, abacus, thimbles, bosun, magnetic declination, barque, bathyscaph, trireme, celestial mechanics, yawl, zodiacs, abeam, radiometer, scrimshaw, lunar module, dowser, brigantine, divining rod, gipsy moth, adz, caduceus, coble, loran, parabolic mirror, robert peary, telescope, tuning fork, whalebone, dowsing, little dipper, cruet, trysail, fishhook, horologist, autogyro, windlass, shallop, nathaniel bowditch, gillie, mercator projection, semaphore, balsa raft, sidewheel, foremast, inertial navigation, compasses, lathe, timepiece, loom, binoculars, phonograph, dredge, mower, plow, propeller, stretcher, typewriter, carburetor, cooker, locomotive, microscope, plows, geostationary, barometrical, clinicopathological, inconclusive, meridian, 100th, 2nd, 77th, 83rd, above, accordant, aforementioned, akali, analogous, anecdotal, anisotropy, aperiodic, apposite, apt, auroral

astrolabe, limb, octant, shoot

circumference

angular unit, measuring instrument, measuring system