The large body that revolves around the sun that you connect with a planetarium is Earth.

Here's why:

* Planetariums are designed to simulate the night sky. They often feature projections of constellations, planets, and other celestial objects as they appear from Earth.

* Earth is the planet we live on and experience the night sky from. Therefore, planetariums are built to represent the view of the cosmos as seen from our planet.

While planetariums might show other planets and celestial objects, the primary focus is on Earth's perspective of the universe.