On Tue, 9 Dec 2003 22:06:23 +0000, Mike Tullett wrote in

snip
One has to
understand the connection between clock time and true sloar time
snip

LOL In case that needs deciphering "sloar" should read "solar". BTW the
darkest evening is in about 5 days time, yet the darkest morning is at the
end of December, another 20 days. The shortest day length remains at the
winter solstice of course.

--
Mike Coleraine posted to uk.sci.weather 09/12/2003 22:10:52 UTC
My aurora images here http://www.mtullett.plus.com/29a-oct and
http://www.mtullett.plus.com/20-nov/