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: Reference Frames
How positions are defined and connected across Earth, time, and space.
Measuring the World
The New NSRS Is Coming: A Field-to-Office Guide for Surveyors
An entry-level, field-to-office guide to NATRF2022, NAPGD2022, SPCS2022, epochs, height modernization, and preparing survey workflows for the modernized National Spatial Reference System.
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.