- electric clock
- time signals
- solar day
- anomalistic year
- rotation time
- data boundary
- uniform time
- atomic clock
- coordinated time
- quartz clock
- sidereal time
- mechanical clock
- calendar (astronomy)
- atomic time
- home time
- terrestrial time
- sidereal day
- mean day
- astronomical twilight
- solar time
- zonal time
- world time
- sundial
- tropical year
- summer time
- sidereal year
- ephemeral time
- civil year