Fri, 10 Jul 2026 02:57:54 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133841#Comment_133841 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133841#Comment_133841 Mon, 06 Feb 2012 09:55:31 +0000 pmagowan https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133844#Comment_133844 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133844#Comment_133844 Mon, 06 Feb 2012 10:01:23 +0000 Ed Davies
http://en.wikipedia.org/wiki/Equation_of_time]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133846#Comment_133846 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133846#Comment_133846 Mon, 06 Feb 2012 10:06:10 +0000 Joiner
pmagowan - David, that's an excellent animated illustration that completely explodes my life-long understanding, one which I'm amazed could have survived this long without challenge and subsequent enlightenment. I wonder how many others held to that simplistic "understanding" that "the sun rises in the east and sets in the west".

In fact, had I not been so concerned about the supposed threat from turbine shadow-flicker from a low sun during winter months and actually got around to checking the azimuth for the summer I'd have lifted that misapprehension myself! Winter (rising) azimuth 116.7; Summer 58.3.

Sorry Nick, no excuse and slapped my own wrist for taking issue with an ex-climate scientist! ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133847#Comment_133847 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133847#Comment_133847 Mon, 06 Feb 2012 10:06:25 +0000 pmagowan ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133852#Comment_133852 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133852#Comment_133852 Mon, 06 Feb 2012 10:17:47 +0000 Joiner ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133854#Comment_133854 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133854#Comment_133854 Mon, 06 Feb 2012 10:22:19 +0000 SteamyTea By picking weekly time slices it gets accurate enough, should really check it more closely but I think it is better than one standard deviation, so right more than 70% of the time. Using weekly means should make it possible to predict heating loads as even a low thermal mass house like mine takes a couple of days for the fabric to cool significantly when sub-zero temperatures come along. A few hours of sunshine and it it back to normal. This is part of my reasoning, that in the UK, low thermal mass is well matched to our weather regime.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133924#Comment_133924 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133924#Comment_133924 Mon, 06 Feb 2012 13:35:56 +0000 djh
We pedants call it 'nutation' Well, actually senile dementia patients who can still remember some things what they were taught decades ago can too.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133941#Comment_133941 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133941#Comment_133941 Mon, 06 Feb 2012 15:06:07 +0000 borpin Posted By: Ed DaviesBasically, because the Earth's orbit is elliptical so we don't go round the Sun at a steady angular rate: Like that. I knew it was something to do with angles and rotations!]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133944#Comment_133944 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133944#Comment_133944 Mon, 06 Feb 2012 15:27:16 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133949#Comment_133949 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133949#Comment_133949 Mon, 06 Feb 2012 15:36:50 +0000 SteamyTea https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133951#Comment_133951 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133951#Comment_133951 Mon, 06 Feb 2012 15:39:52 +0000 pmagowan https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133956#Comment_133956 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133956#Comment_133956 Mon, 06 Feb 2012 16:00:49 +0000 SteamyTea Posted By: pmagowanslightly imperfect 24hour spin
That's for leap seconds I think as we know the Earth is spinning slower and slower.
The irregularity is partly caused by the ocean tides which do not coincide with 24 hour cycle. This causes a bulge to one side more than another, which changes the angular momentum, the next day that bulge is in a slightly different place, changing it get again. Land masses getting in the way throw it out even more, as does the gravity caused by a large water mass (it sucks in more that just the force of the moon and sun's gravity would suggest). Amazing we are here at all really.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133957#Comment_133957 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133957#Comment_133957 Mon, 06 Feb 2012 16:11:05 +0000 pmagowan ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133960#Comment_133960 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133960#Comment_133960 Mon, 06 Feb 2012 16:36:58 +0000 DamonHD
Rgds

Damon]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133961#Comment_133961 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133961#Comment_133961 Mon, 06 Feb 2012 16:38:08 +0000 SteamyTea https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133962#Comment_133962 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133962#Comment_133962 Mon, 06 Feb 2012 16:38:42 +0000 pmagowan https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133963#Comment_133963 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133963#Comment_133963 Mon, 06 Feb 2012 16:41:24 +0000 SteamyTea ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133965#Comment_133965 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133965#Comment_133965 Mon, 06 Feb 2012 16:46:50 +0000 Joiner ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133968#Comment_133968 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133968#Comment_133968 Mon, 06 Feb 2012 16:55:21 +0000 SteamyTea https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133977#Comment_133977 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133977#Comment_133977 Mon, 06 Feb 2012 17:54:28 +0000 skyewright

Lots of solar gain.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133978#Comment_133978 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133978#Comment_133978 Mon, 06 Feb 2012 17:55:21 +0000 Joiner ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133982#Comment_133982 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=133982#Comment_133982 Mon, 06 Feb 2012 18:00:46 +0000 skyewright ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134094#Comment_134094 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134094#Comment_134094 Tue, 07 Feb 2012 11:34:27 +0000 Joiner ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134095#Comment_134095 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134095#Comment_134095 Tue, 07 Feb 2012 11:34:40 +0000 Joiner
http://www.srrb.noaa.gov/highlights/sunrise/azel.html]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134099#Comment_134099 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134099#Comment_134099 Tue, 07 Feb 2012 11:42:29 +0000 Joiner
So obvious when you have pretty pictures to look at.

http://www.srrb.noaa.gov/highlights/sunrise/solarpaths.gif]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134138#Comment_134138 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134138#Comment_134138 Tue, 07 Feb 2012 14:20:20 +0000 DamonHD
I have to say that I too was amazed when I realised, and I put a little PV up on a ENE roof when I realised just how much sun it could get, contrary to intuition.

(Now please explain the 'adjusting opinions to fit facts' procedure to Nigel Lawson, since he is still stuck on the reverse...)

Rgds

Damon]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134149#Comment_134149 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134149#Comment_134149 Tue, 07 Feb 2012 15:36:43 +0000 Joiner Trouble is, I've now become an Azimuth Bore.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134155#Comment_134155 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134155#Comment_134155 Tue, 07 Feb 2012 15:52:31 +0000 SteamyTea ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134164#Comment_134164 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134164#Comment_134164 Tue, 07 Feb 2012 16:45:54 +0000 Joiner ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134171#Comment_134171 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8554&Focus=134171#Comment_134171 Tue, 07 Feb 2012 18:12:48 +0000 DamonHD