Depends what you call a wobble. If the earth spun perfectly on its axis there would be no wobble but it doesn't. It is like a spinning top running down where the top starts to describe a circle in the air making the body 'wobble' as I call it. There would still be seasons due to the tilt of the axis relative to the orbital plane but no 'wobble'. You can use software to view the earth as from the sun and speed up time, it wobbles back and forth in a similar way the moon does to the earth.

(Janitor - the advice to the anti campaign was to avoid their coming up against the NIMBYs who insist it's OK to put up turbines because it's "only" bothering people they don't give a toss about. In other words, they're OK because they're Not In My Back Yard. But that's a digression well covered in other threads where my position has been made very clear.)

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!

...feel free.

"It is like a spinning top running down where the top starts to describe a circle in the air making the body 'wobble' as I call it."

We pedants call it 'nutation' Well, actually senile dementia patients who can still remember some things what they were taught decades ago can too.

I'm v alarmed that Earth's nutating - it shd be stopped and re-started properly. Look what happens to a spinning top just after it starts nutating.

I think that is due to the slightly imperfect 24hour spin that we have.

As far as I am aware a day is how long it takes the planet to spin on it's axis. This is close enough to 24 hours to not matter much. There are other definitions which pertain to shipping and astronomy etc but these are more to reference positions of other astronomical bodies accurately relative to your position on earth. In this instance obviously all other pertubations of the earths 3 dimensional movement will be important as they will effect the relative positions of e.g. a star in the sky. For these there are a set of tables made up which allow the use of a sextant etc. There are many pertubations in the 3D movement from all sorts of effects, moon, orbit, sun, nutation etc. I will generally stick with day being average time taken to spin 1 full rotation. After all if you get really technical then all these other effects are just fluctuations in spacetime and could be disregarded

Back to my Temperature gain caused by Solar, anyone see any problems with my thinking on it?

Drizzle all day today, quite rare for down here.

Wish I'd found all this lot before making a complete prick of myself!

So obvious when you have pretty pictures to look at.

http://www.srrb.noaa.gov/highlights/sunrise/solarpaths.gif

Trouble is, I've now become an Azimuth Bore.

Nah, that's someone who can't stop talking about tidal barrages.