Alex You say in your note "But in mathematics uuufffff," - but this is not mathematics, it's astronomy! Nothing in the heavens moves with absolute uniformity…..
If you want the very best astronomical calculations, then you must use the best technology and that is provided free by NASA-JPL. Their software is used to put spacecraft on Mars etc. and is continuously updated for changes in Delta T. You can access their software - which is called Horizons - at http://ssd.jpl.nasa.gov/horizons.cgi The people who produce the Astronomical Almanacs use JPL's routines for the positions of solar system objects Best regards Kevin Karney Freedom Cottage, Llandogo, Monmouth NP25 4TP, Wales, UK 51° 44' N 2° 41' W Zone 0 + 44 1594 530 595 --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
