"Victor" no@spam wrote in message ...
**** Post for FREE via your newsreader at post.usenet.com ****

Ok, this is what I do:

I set Redshift's time to 03/20/2004 06h:48m which is the time for the
vernal
equinox this year
Set the sun's image to "icon". Look at the sun, it is over the vernal
equinox.
Now enter 2000 and select Tropical years in time step. Press time step
forward once. The time now is 03/19/4004 15h:55m.
Look at the sun: It has displaced from the vernal equinox and you need to
move the time forward about 10 hours in order to put them together again.
Anyone has an explanation?



I'm not sure, but it may be that the "tropical year" timestep is in current
tropical year lengths, while the Earth's ephemeris calculation is in
terrestrial dynamic time with corrections to UT calculated by extrapolations
of the UT-DT difference formula.

--
Mike Dworetsky

(Remove "pants" spamblock to send e-mail)