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TimeScales
github-actions[bot] edited this page May 30, 2026
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moon-sighting / TimeScales
Defined in: types.ts:67
All relevant time scale values for a single moment
deltaAT:
number
Defined in: types.ts:80
TAI - UTC in seconds (leap seconds count)
deltaT:
number
Defined in: types.ts:78
TT - UT1 in seconds (delta-T)
jdTDB:
number
Defined in: types.ts:74
Julian Date in Barycentric Dynamical Time (used by JPL ephemerides)
jdTT:
number
Defined in: types.ts:72
Julian Date in Terrestrial Time (TT = TAI + 32.184s)
jdUT1:
number
Defined in: types.ts:76
Julian Date in UT1 (Earth rotation time)
jdUTC:
number
Defined in: types.ts:70
Julian Date in UTC
utc:
Date
Defined in: types.ts:68
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