What determines how quickly a ship repairs?

After a battle, more often than not a player's ships can become quite damaged and will take a lengthy amount of time to repair. The regular repair rate for a ship seems to be about 1hp per turn, but I'm not at all sure if this is the norm and what factors affect how quickly a ship is repaired.

What are the rules around ship repair?

Does returning a ship to a starbase, shipyard, planet or friendly territory cause a ship to repair faster? If so by what degree?

Solution 1:

According to a response to the post "quickest way to regenerate ship health?" in the Gal Civ 3 steam forum:

Sitting/moving in space repairs 0.75 to 1.25 points per turn (every third turn you get zero, one or two points depending on your repair rate). Orbiting a planet repairs at 4 x this rate (three to five points per turn). Shipyards and star bases are almost as fast as planets for repair.

Faster repair times are available via research; however, they become available in the mid to late game period.

This is the closest I've found yet about the official repair rules.