* Radius is a property of a single object: The radius refers to the distance from the center of an object to its edge. You can talk about the radius of the Sun or the radius of the Moon, but not a radius between them.
* Distance is between two objects: The distance between the Sun and the Moon is constantly changing, as the Moon orbits the Earth and the Earth orbits the Sun.
What you might be interested in:
* Distance between the Sun and the Moon: This is a complex calculation that involves considering the positions of the Sun, Earth, and Moon in their respective orbits. You can find the average distance, but it's constantly changing.
* Angular size: You could calculate the angular size of the Sun and Moon as seen from Earth. This would give you the apparent size of each object in the sky, but not a "radius" between them.
To summarize, the concept of "radius of sun to moon" is not scientifically meaningful. You need to be more specific about what you're trying to find.
