Space geodesy

Space geodesy is geodesy by means of sources external to Earth, mainly artificial satellites (in satellite geodesy) but also quasars (in very-long-baseline interferometry, VLBI) and the retroreflectors on the Moon (in lunar laser ranging, LLR). Space geodesy is geodesy by means of sources external to Earth, mainly artificial satellites (in satellite geodesy) but also quasars (in very-long-baseline interferometry, VLBI) and the retroreflectors on the Moon (in lunar laser ranging, LLR).