On Thu 2004-01-29T18:01:04 -0500, jcowan_at_reutershealth.com hath writ:
> Of course, there is no "actual mean sun"; the luminous orb in the sky is the
> "actual actual sun".
I would wryly ask whether you intend to refer to the "actual actual
sun" or the "apparent actual sun".
This is relevant to the question of why the epoch of ephemeris time
at the beginning of 1900 does not correspond to the moment when
Delta T was 0 (sometime near the beginning of 1902).
But if I did ask that I would be opening an old astronomical wound
about the constant of aberration used during the initial studies that
led to the creation of ephemeris time as a replacement for universal
time. And that's not to mention the light lag...
--
Steve Allen UCO/Lick Observatory Santa Cruz, CA 95064
sla_at_ucolick.org Voice: +1 831 459 3046 http://www.ucolick.org/~sla
PGP: 1024/E46978C5 F6 78 D1 10 62 94 8F 2E 49 89 0E FE 26 B4 14 93
Received on Thu Jan 29 2004 - 15:08:38 PST