Measuring the World
Measuring the Earth–Moon System: Lunar Laser Ranging and Millimeter Geodesy
How Apollo-era retroreflectors let observatories measure the Moon, test gravity, and strengthen lunar reference frames.
From the Index
Tag: Apollo Program
Reports, histories, and working notes filed under this subject.
Exploration & Places
Finding the Moon: Reference Frames, Optical Sights, and Apollo Navigation
How inertial platforms, optical observations, radio tracking, maps, and reference frames guided Apollo between Earth and Moon.