Question 1595Navigation General

The correct answer is C) Vertical libration. The four types of libration that the Moon is subject to are: 1) Libration in latitude, 2) Libration in longitude, 3) Diurnal libration, and 4) Parallactic libration. Vertical libration is not one of the four types of libration observed on the Moon. Libration in latitude, libration in longitude, and diurnal libration are real physical motions of the Moon, while parallactic libration is an apparent motion due to the change in the observer's position. Vertical libration, on the other hand, is not a recognized type of lunar libration.