heliometer
noun
he·li·om·e·ter
ˌhē-lē-ˈä-mə-tər 
: 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
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“Heliometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliometer. Accessed 30 Dec. 2024.
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