On 2019-07-26 21:39, Pierpaolo Bernardi wrote:

Il giorno 27 luglio 2019, alle ore 05:17, David Patte ha scritto:

...

For my products I use an algorithm (Meeus; Astronomical Algorithms 1998) to 'predict' deltaT into the future. Does anyone have a good source for a more recent algorithm that takes into account IERS values since 1998?

IERS (and USNO if you can get thru) have a lot of info, links, and refs about what they are doing now both in rapid prediction and longer term.

This page  may be a start: https://eclipse.gsfc.nasa.gov/SEhelp/deltatpoly2004.html

...adapted from NASA Technical Publication "Five Millennium Catalog of Solar Eclipses: -1999 to +3000" (NASA/TP-2009-214174) by Fred Espenak and Jean Meeus, described in https://eclipse.gsfc.nasa.gov/SEpubs/5MKSE.html with text at https://eclipse.gsfc.nasa.gov/5MCSE/5MCSE-Text11.pdf (2MB), available at https://eclipse.gsfc.nasa.gov/5MCSE/TP2009-214174.pdf (13MB), maps and plates at https://eclipse.gsfc.nasa.gov/5MCSE/5MCSE-Maps-[01-12].pdf (20MB each), catalogues and indices in https://eclipse.gsfc.nasa.gov/5MCSE/5MCSEcatalog.txt (1MB), https://eclipse.gsfc.nasa.gov/5MCSE/5MCSEplate.html (70KB), https://eclipse.gsfc.nasa.gov/SEcat5/SEcatalog.html (30KB); uncertainty is summarized in https://eclipse.gsfc.nasa.gov/SEcat5/uncertainty.html and the web pages have links and published refs on basis and background. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised.