Luke Coletti <[EMAIL PROTECTED]> writes: > Lastly, independent of this large scale variation, Perihelion during the > period 1980-2020 is shifting (eastward) at 12 arc-seconds per year. I hope > that does it.
I make out 12 arc-sec/yr to be a period of 108,000 yrs. That's bigger than the period of the precession of the Equinoxes, but not by all that much. On the other hand, since we are talking about a correction to a correction to solar time, we could probably live with the error on a 10,000 year time scale. I would be inclined to include it anyway, at least if it is rather regular, which I would guess that it is. I'm getting out of my depth. I definitely need to read Meeus. Thanks for the lessons in celestial mechanics. Art
