1. a slow oscillation or apparent wobbling motion of a celestial body, especially the moon as seen from Earth
Usage: astronomy
2. the state of being balanced or poised
Usage: formal

Examples

• The moon’s libration allows us to see slightly more than half of its surface over time.
• Astronomers study lunar libration to better understand the moon’s rotation.
• The spacecraft’s libration point provided a stable position for observations.
• Due to libration, we can observe about 59% of the moon’s surface from Earth.
• The satellite maintained perfect libration between the gravitational forces.
• Libration occurs because the moon’s orbit is elliptical rather than circular.