1. the point in the orbit of a body around the Moon at which it is farthest from the Moon
Usage: astronomy; technical term

Examples

• The spacecraft reached apolune at a distance of 3,000 kilometers from the lunar surface.
• At apolune, the satellite moves more slowly than at any other point in its orbit.
• The mission planners calculated the apolune altitude to ensure safe passage over the Moon's mountains.
• Unlike perilune, apolune represents the maximum distance from the Moon during orbital motion.