IPA: /ˌhiːliəʊˈsɛntrɪk/
KK: /hiˈliːoʊˌsɛntrɪk/
Relating to a model of the solar system where the sun is at the center and the planets orbit around it.
The heliocentric model changed our understanding of the universe by placing the sun at the center.
Heliocentric is formed from "helio-" (from Greek "helios", meaning sun) and "centric" (from Greek "kentron", meaning center). The word describes a model where the sun is at the center of the solar system.
Think of the sun ('helio-') being at the center ('centric') — that's why heliocentric means sun-centered.