Category
page 1Time scales
UTC
principal time standard that underlies civil times on Earth
sidereal time
time standard
solar time
calculation of elapsed time by the apparent position of the sun
standard time
synchronization of clocks within a geographical area or region
universal time
time standard based on the Earth's rotation
International Atomic Time
time scale based on atomic clocks
Unix time
system for identifying instants in time; the number of seconds that have elapsed since the UTC midnight before 1 January 1970, ignoring leap seconds
ephemeris time
time standard
Terrestrial Time
time standard for astronomical observations from the Earth
time standard
specification for measuring time
local mean time
form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude
DUT1
thumb|right|400px|Graph showing the difference in seconds between UT1 and [[UTC over time. A vertical transition indicates the use of a leap second. The red portion of the graph indicates predicted values.]]
Coordinate time
Time scale
civil time
standard for the measurement of time in some given area, which allows determining which conventional timezone to apply locally and usually to the social and civil life
ΔT
Measure of variation of solar time from atomic time
Barycentric Coordinate Time
Calculations pertaining to orbits
dynamical time
time standard
Barycentric Dynamical Time
scale of time
Geocentric Coordinate Time
time standard used in astronomy
Nuclear timescale
Estimate of the lifetime of a star
Mission Elapsed Time
time scale used by NASA during their space missions
Thermal time scale
Stellar astronomy - time scale
Byzantine time
timekeeping system in which 0:00:00 begins daily at sunset rather than midnight
Nautical time
Railway time
Time scale for rail transport