Mr. Sappenfield needs to learn some astronomy. Titan is not a moon of Saturn. It is a satellite of Saturn; a natural satellite, if one needs to make the distinction. There is only one Moon in the Solar System; it orbits the Earth as its only known natural satellite.
"Mr. Sappenfield needs to learn some astronomy. Titan is not a moon of Saturn. It is a satellite of Saturn; a natural satellite, if one needs to make the distinction."
Of course it is a moon.
Any object orbiting a star (i.e. a natural satellite of that star) is called a Planet (obviously). Any object orbiting a planet itself, being a satellite of said planet, is called a Moon. The Earth has a moon, the name of which is "Luna". Most other planets have moons as well.
Titan is a moon of Saturn, being a natural satellite of Saturn makes it one.
Bones