The quality or state of being heliocentric; the actual or conceptual condition of having the sun as the center point of a planetary system.
From heliocentric plus '-ity' suffix (creating abstract nouns for qualities or states), providing an alternative to heliocentricism for discussing the concept itself.
The heliocentricity of our solar system seems obvious now, but it took centuries of observation and math to prove what ancient stargazers got wrong!
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