Leap second
A leap second is an extra second inserted into Coordinated Universal Time to keep it aligned with Earth's rotation. It is a convention tied to the spin of one planet, and whether a lunar scale should inherit those steps is still open.
Related terms
- Contrasted with
- SI second
Other terms worth reading next.
All thirty entries are in the glossary of lunar timekeeping.
Where it appears
Primary documents that use the term.
- OSTP Celestial Time Standardization memo (2024) [1]Official
Sources
Last verified