Moon over Rigel VII

From Memory Alpha, the free Star Trek reference

Moon over Rigel VII was a song with fairly simple lyrics, apparently inspired by a natural satellite of the planet Rigel VII.

In 2287, while camping in Yosemite National Park, James T. Kirk suggested singing this song around the campfire, among other songs such as Row, Row, Row Your Boat and Pack Up Your Troubles. (Star Trek V: The Final Frontier)