Proper time
Proper time is the time measured by a real clock along its own path through space-time. Two clocks at different gravitational potentials or in different motion accumulate different proper time, which is why a lunar clock and a terrestrial clock drift apart.
Rate figures quoted on this site are model values, computed from the published definitions. See how we calculate lunar time.
Related terms
- Contrasted with
- Coordinate time
Other terms worth reading next.
All thirty entries are in the glossary of lunar timekeeping.
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