I was never sure if they were moons or planets. While logic makes it pretty clear that they're moons, Nanoha is much more fun without logic.

Officially Mid Childa only has two moons, so the others must be neighbouring worlds.

And officially Nanoha and Fate qualify as the youngest and hottest MILFs in anime.

Who says a moon cannot be a planet-or have a biosphere-unto itself?

@Byakugan: Planets orbit a star. Moons orbit a planet. Moons certainly can have atmospheres though, such as Titan.