IPA: /lɪˈbreɪʃənl/
KK: /lɪˈbreɪʃənl/
Related to the small oscillations or movements of an object, especially in the context of celestial bodies.
The librational movements of the moon can affect its visibility from Earth.
Librational → It is formed from "libra" (from Latin, meaning balance or scale) and the suffix "-tional" (meaning relating to or characterized by). The word "librational" refers to something that is related to or characterized by balance.
Think of 'libra' which means balance, and remember that 'librational' relates to balance or equilibrium.