semidiameter
noun
semi·di·am·e·ter
ˌse-mē-dī-ˈa-mə-tər 
ˌse-ˌmī-,
-mi-
: radius
specifically
: the apparent radius of a generally spherical celestial body
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“Semidiameter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semidiameter. Accessed 31 Dec. 2024.
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