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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 electrometer radiometer chronometer spectrometer speedometer manometer densitometer odometer pedometer micrometer fathometer dynamometer magnetometer tachometer sphygmomanometer anemometer tacheometer disk photometer prism spectrometer milometer psychrometer half chronometer actinometer pocket chronometer mass spectrometer electronic chronometer sclerometer marine barometer precision barometer