Fred Espenak at the NASA Eclipse Home Page
has a nice, short article on "Historical Values of Delta T" which is a definite "must read" for anyone interested in the confluence of Astronomy and the History of Civilization.
Espenak's page also has four links to Delta T pages online as follows:
- Delta T - NASA Eclipse Home Page
- Delta T - Felix Verbelen (Belgium)
- Delta-T - Robert van Gent (The Netherlands)
- Delta T - IERS Rapid Service/Prediction Center