Assertion: moon | /r/HasProperty | classed in two separate categories
Facets:
value: according to their orbits
type: OTHER
Source sentences:
text: Moons are classed in two separate categories according to their orbits: regular moons, which have prograde orbits (they orbit in the direction of their planets' rotation) and lie close to the plane of their equators, and irregular moons, whose orbits can be pro- or retrograde (against the direction of their planets' rotation) and often lie at extreme angles to their planets' equators.