Time standard · TDB
Barycentric Dynamical Time
The time coordinate of the Solar System barycentre, used as the independent variable of the planetary ephemerides. It differs from Terrestrial Time only by small periodic terms arising from the Earth's motion around the Sun, never drifting by more than a couple of milliseconds.
Bodies, frames & concepts
Knowledge connections
- Associated withTerrestrial Time
- Associated withJPL Development Ephemeris
Sources
The primary and reference sources this topic draws on.
- US Naval ObservatoryUnited States Naval Observatory
Precise time, almanac data, Sun/Moon rise-set, and phases.