Geoid
The geoid is the equipotential surface of Earth's gravity field that mean sea level follows. Terrestrial Time is the time of a clock at rest on it, which makes the geoid the reference level that lunar clock rates are quoted against.
Related terms
- Contrasted with
- Selenoid
Other terms worth reading next.
All thirty entries are in the glossary of lunar timekeeping.
Where it appears
Primary documents that use the term.
- NIST's relativistic framework for lunar clocks [1]
Sources
Last verified