Hi Luc,

> I was also wondering if there is a possibility to
> enter his own value for the Delta_T. When studying old eclipses, it is very
> usefull to try several value of delta T and see what happens.

This can be done... in fact, you can even specify linear or quadratic
or higher-order polynomials to be used over specified intervals:

http://www.projectpluto.com/update7.htm#delta_t_def

Speaking of such matters: the next update posted will include the
recently announced UTC leap second for 2012 July 1.

-- Bill