When the sun is at the center of something, it's called a heliocentric system.

This refers to the idea that the sun is the center of our solar system, with the planets orbiting around it. This idea was first proposed by Aristarchus of Samos in the 3rd century BC, but it wasn't widely accepted until the 16th century when Nicolaus Copernicus published his heliocentric model.

Here are some examples of where the term "heliocentric" is used:

* Heliocentric model: The model of the solar system with the sun at the center.

* Heliocentric coordinates: A system of coordinates that uses the sun as the origin point.

* Heliocentric perspective: A view of the solar system from the sun's perspective.

Let me know if you have other questions!