High Quality Content by WIKIPEDIA articles! Lunar theory attempts to account for the motions of the Moon. There are many irregularities (or perturbations) in the Moon`s motion, and many attempts have been made over a long history to account for them. After centuries of being heavily problematic, the lunar motions are nowadays (see Modern developments) modelled to a very high degree of accuracy. Several aspects of lunar theory have accordingly become largely about history. But newly achieved levels of accuracy have also turned lunar theory into a sensitive instrument for new tests of physical theories.