How should things relating to Earth's moon, "Luna"/"The Moon" be tagged. The usual way of distinguishing between our moon and moons in general is to capitalise the word when referring to Earth's moon. Upper-case is not available for tagging. Also, in speech and braile, where case distinction is also absent, longer phrases are used, which we cannot do with tagging either.
I would say the-moon should be set for Earth's moon. If we do that, and ban the use of the tag moon, then a user will be forced to choose between the two. Give an adequate tagwiki, and the problem should be trivial.
Furthermore, there are a few related changes that should be made: