Equations for ΔT calculationshttp://astro.uni-altai.ru/~aw/DeltaT/
IERS Rapid Service/Prediction Centerhttp://maia.usno.navy.mil/
Polynomial __EXPRESSION__s for Delta T (ΔT)http://eclipse.gsfc.nasa.gov/SEhelp/deltatpoly2004.htmlΔT before the Telescopic Erahttp://www.staff.science.uu.nl/~gent0113/deltat/deltat_old.htm