On Fri, 26 Nov 2004 14:35:53 GMT, Roger Smith wrote in


"Gavin Staples" wrote in message
...

I wonder if anyone can give the precise reasons for why it gets marginally
darker in the mornings for a week or so after Dec 21st. The late Michael
Hunt from Anglia TV gave a description as to why. However, this was now
over
20 years ago and I cannot remember the precise reasons. Apart from the
fact
it is due to the fact that the earth's rotation around the sun is not a
precise circle, despite popular belief that it is. I cannot remember the
other reasons.
I wonder if anyone on this ng does know why?

Gavin.

Gavin, Google or similar on "Equation of Time".

This topic comes up quite often. The last time we discussed it here was
last December. Here is the thread as archived by Google.

http://groups.google.co.uk/groups?hl...3D%26 hl%3Den

or

http://makeashorterlink.com/?O1C0310E9

--
Mike 55.13°N 6.69°W Coleraine posted to uk.sci.weather 26/11/2004 14:46:36 UTC

"Joe" wrote in message
...
Hello All,

It's that old chestnut, can anyone point me in the right direction for a
table of the sunrise/sunset times of December and January.

Has a woman that I work with was saying that the nights get lighter
after 21st December, when it's actually about a week earlier than the
21st.

Joe
Wolverhampton


http://www.analemma.com/Pages/framesPage.html


Probably the best explaination ou there, despite the dodgy sounding URL!

Steve wrote:
"Joe" wrote in message
...

Hello All,

It's that old chestnut, can anyone point me in the right direction for a
table of the sunrise/sunset times of December and January.

Has a woman that I work with was saying that the nights get lighter
after 21st December, when it's actually about a week earlier than the

21st.

Joe
Wolverhampton



http://www.analemma.com/Pages/framesPage.html


Probably the best explaination ou there, despite the dodgy sounding URL!



Thanks Steve, though I read the URL as ana-lemma, must have led a
sheltered life ! ;-)

Joe
Wolverhampton

You might find this site handy:

http://www.sunrisesunset.com/custom_srss_calendar.asp


It allows you to enter latitude & Longitude, shows sun rise & Set,
moon rise & set, Twilight times, and prints in a nice calendar format



Douglas

Joe wrote:

Hello All,

It's that old chestnut, can anyone point me in the right direction for a
table of the sunrise/sunset times of December and January.

If anyone is Java-minded, then I wrote a package to calculate sunrise
and sunset times: http://www.jstott.me.uk/jsuntimes/

There's also a simple application on there to find the sunrise and
sunset time for a particular date/location.

--
Jonathan Stott
Canterbury Weather: http://www.jstott.me.uk/weather/

"Mike Tullett" wrote in message
...
On Fri, 26 Nov 2004 14:35:53 GMT, Roger Smith wrote in


"Gavin Staples" wrote in message
...

I wonder if anyone can give the precise reasons for why it gets
marginally
darker in the mornings for a week or so after Dec 21st. The late
Michael
Hunt from Anglia TV gave a description as to why. However, this was now
over
20 years ago and I cannot remember the precise reasons. Apart from the
fact
it is due to the fact that the earth's rotation around the sun is not a
precise circle, despite popular belief that it is. I cannot remember
the
other reasons.
I wonder if anyone on this ng does know why?

Gavin.

Gavin, Google or similar on "Equation of Time".

This topic comes up quite often. The last time we discussed it here was
last December. Here is the thread as archived by Google.


http://groups.google.co.uk/groups?hl...vui2oqnpr0tgcr
6pn7l7cfll%404ax.com&rnum=7&prev=/groups%3Fas_q%3Dsunrise%2520sunset%2520tim
es%26safe%3Dimages%26as_ugroup%3Duk.sci.weather%26 lr%3D%26hl%3Den

or

http://makeashorterlink.com/?O1C0310E9

--
Mike 55.13°N 6.69°W Coleraine posted to uk.sci.weather 26/11/2004
14:46:36 UTC



Thanks very much:-) Thank goodness I did a decent bit of physics :-)

Regards, Gavin.

"Joe" wrote in message

http://www.analemma.com/Pages/framesPage.html

Probably the best explaination ou there, despite the dodgy sounding URL!

There is also a nice piece of software the

http://www.analemma.com/SunGraph/index.html

that runs on PC and Mac. Hence I can check the sunrise time every
morning, and compare it with reality. Reality is never right.

Trevor
http://www.personal.dundee.ac.uk/~taharley/

Trevor Harley wrote:

"Joe" wrote in message

http://www.analemma.com/Pages/framesPage.html

Probably the best explaination ou there, despite the dodgy sounding URL!


There is also a nice piece of software the

http://www.analemma.com/SunGraph/index.html

that runs on PC and Mac. Hence I can check the sunrise time every
morning, and compare it with reality. Reality is never right.

Trevor
http://www.personal.dundee.ac.uk/~taharley/


You mean the software is never right?

Joe
Wolverhampton

Trevor Harley wrote:

"Joe" wrote in message

http://www.analemma.com/Pages/framesPage.html

Probably the best explaination ou there, despite the dodgy sounding URL!


There is also a nice piece of software the

http://www.analemma.com/SunGraph/index.html

that runs on PC and Mac. Hence I can check the sunrise time every
morning, and compare it with reality. Reality is never right.

Trevor
http://www.personal.dundee.ac.uk/~taharley/



Though excellent thought out program

Joe
Wolverhampton

On 2004-11-27 10:36:38 +0000, Joe said:
Trevor Harley wrote:
There is also a nice piece of software the
http://www.analemma.com/SunGraph/index.html
that runs on PC and Mac. Hence I can check the sunrise time every
morning, and compare it with reality. Reality is never right.
Trevor
http://www.personal.dundee.ac.uk/~taharley/
You mean the software is never right?
Joe

No, it's a big mistake to trust sensory data too much. I trust
software. But what with the hills around here the sun always appears
later (and sets earlier) than the programme says.

Trevor