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nounan instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope
Words sounding like good heliometer
barometer radiometer electrometer chronometer spectrometer speedometer manometer densitometer odometer pedometer micrometer fathometer dynamometer tachometer magnetometer sphygmomanometer anemometer tacheometer transmission dynamometer torsion galvanometer tint photometer suction anemometer string galvanometer siphon barometer sine galvanometer scintillation spectrometer recording hygrometer recording barometer recording anemometer quadrant electrometer