Linked from
The 18 pages that link to Lunar laser ranging, each with the reason it gives.
Orbital perturbationRelated: Long-term measurements reveal subtle perturbations in the lunar orbit.
Lunar explorationRelated: Repeated measurements test lunar motion and the Moon's internal structure.
Earth's MoonRelated: It precisely tracks the Moon's orbit and tests gravitational physics.
Lunar theoryRelated: Its observations test and refine dynamical models of lunar motion.
Lunokhod 1Related: Lunokhod 1’s reflector became a target for laser measurements from Earth.