On Sat 2003-01-25T12:08:03 -0800, Ken Pizzini hath writ:
> Yes; my first "near equinox" claim was actually closer to the truth.
> I'll shut up and let someone who actually knows what they're talking
> about enlighten us about the conditions in which one observed
> noon-to-noon interval can be closely matched to the duration a
> mean solar day.
Get an analemma. There are 4 days during the year when the curve
moves purely north/south and not east/west. On those 4 days the
mean solar day matches the noon to noon interval.
--
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 Sat Jan 25 2003 - 17:09:45 PST