Bluebulb Projects' The Measure of Things presents:
120 is about four-fifths the number of Moons in our Solar System.
In other words, it's 0.822 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 1.22 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
Astronomers and other scientists have confirmed the presence of 146 moons orbiting the major planets of our Solar System. About one third of those moons — 53 — are in orbit around the planet Saturn