What is another word for Heliometer?
Pronunciation: [hˌɛlɪˈɒmɪtə] (IPA) 
A heliometer is a scientific instrument that measures the angle between two celestial objects. Synonyms for this word include astrolabe, gnomon, theodolite, and sextant.
The astrolabe is a historic predecessor to the heliometer that was used to measure the altitude and azimuth of celestial bodies. A gnomon is a device that tracks the position of the sun and was used by ancient civilizations. Theodolites are surveying instruments that measure horizontal and vertical angles and are used for geodetic measurements. A sextant is a nautical instrument used to measure the angle between the horizon and a celestial body to calculate latitude and longitude. These instruments have been crucial for navigation and scientific research, dating back centuries.
