I write this message only for curiosity: I know very well that the excessive precision is not necessary in our applications !
Jim Cob gives this instant of the Spring Equinox : 7h 25m 10s (program XEphem ) With a program based on the algorithms of J. Meeus (Astronomical Algorithms) I find that the Declination and the RA become zero at 7h 34m 22s J.Meeus in the book "Astronomical Table..." gives the value 7h 36m 37s With the program AstroCalc Prof.-Zephyr 1990, I' ve found 7h 33m 11s (Apparent Long. =0) Dialist Companion gives : 7:25m 14s (Decl. =0) All time in UT What is the most correct value ? Gianni Ferrari
