Re: length of day
- From: tomkirke@xxxxxxx (Tom Kirke)
- Date: Fri, 06 May 2005 14:52:45 -0500
In article <d5g8tv$odf$3@xxxxxxxxxxxxxxxxxxxx>, Prai Jei
<pvstownsend@xxxxxxxxxxxxxxxxxxx> wrote:
> Jeff Nadir (or somebody else of the same name) wrote thusly in message
> <ZpWdnSn0krgxfuffRVn-uA@xxxxxxxxxx>:
>
> > A table of sunrise/sunset times for Toronto shows that the interval
> > between sunrise and sunset is always a few minutes longer on the first day
> > of autumn than on the first day of spring. Why?
>
> You will find that the latest possible sunset and the earliest possible
> sunrise don't coincide with the summer solstice. Don't know about Toronto,
> but here in Cardiff (lat 51deg N) earliest sunrise occurs in mid June and
> latest sunset in early July, either side of the solstice.
>
> No doubt it's for the same reason, this equation of time thingy.
Sky & Telescope two or three issues back had a nice explination
of this with some diagrams. The variations in SR & SS have to do
with where the sun is on the analema. Two minutes looking at the
diagram will do more that I can to explain this.
If you want I'll look up the exact reference, let me know on list.
It would be Tuesday or Wednesday before I could reply however.
Dark skies,
tom
PS Is Gerald really "That Lady" ( whose-name-I-dare-not-utter-lest-
she-return ) in different guise?
--
We have discovered a therapy ( NOT a cure )
for the common cold. Play tuba for an hour.
.
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- From: Jeff Nadir
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