Data and algorithms
世界时差
Delta T
The mismatch between atomic and Earth-rotation time.
It drifts by roughly a second a year today.
Related terms
- Parsec — Distance at one arcsecond parallax, 3.26 light-years.
- Declination — The celestial equivalent of latitude.
- Right ascension — The celestial equivalent of longitude, in hours.
- Epoch — The reference time for coordinates or elements.