Callisto is very far from the sun, orbiting Jupiter at an average distance of about 1.88 billion kilometers (1.17 billion miles). Due to this immense distance, it receives very little sunlight.

Here's a breakdown:

* Sunlight Intensity: Callisto receives about one-twenty-seventh the amount of sunlight that Earth receives. This is approximately 0.04% of the sunlight Earth receives.

* Brightness: The sun would appear as a very bright star in the Callistoan sky, but not nearly as bright as it appears from Earth.

* Daylight: Despite this low level of light, Callisto does experience a sort of daylight. It has a very long day (about 400 Earth days) due to its slow rotation, so sunlight does illuminate the surface for a significant portion of its day.

To put this in perspective, imagine you're in a room with a single, very dim light bulb. That's roughly how bright the sun would appear from the surface of Callisto.