# Apache Point Observatory Lunar Laser-ranging Operation

> project at the Apache Point Observatory in New Mexico; extension and advancement of previous Lunar Laser Ranging experiments, which use retroreflectors on the Moon to track changes in lunar orbital distance and motion

**Wikidata**: [Q4778939](https://www.wikidata.org/wiki/Q4778939)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Apache_Point_Observatory_Lunar_Laser-ranging_Operation)  
**Source**: https://4ort.xyz/entity/apache-point-observatory-lunar-laser-ranging-operation