Heliopolitics

Heliopolitics is the study of the effects of heliography on stellar politics. It was mostly used by humans during the Age of the Expansion to describe how heliography affects the relationships between the different independant celestial nations of the Solar system. It disappeared and was replaced by galactopolitics after the union of the entire Solar system during the Age of Encounters.

Etymology
The word comes from the Greek prefix helio ("what is about the Sun") and from the word politics derived from the Greek word politikós ("citizen").