Definition of heliometer
: a visual telescope that has a divided objective designed for measuring the apparent diameter of the sun but also used for measuring angles between celestial bodies or between points on the moon
Origin of heliometer
French héliomètre, from hélio- 1heli- + -mètre -meter
First Known Use: 1753
Learn More about heliometer
Britannica.com: Encyclopedia article about "heliometer"
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