It suddenly occurred to me that the moon appears to ride the rainbow. Not that that is what I saw but it did seem to point out the obvious astronomical effects.
It was a nearly flat sided moon (first Quarter having just passed.) When the moon rises that slab side always stays in the same position as if a giant wind-sreen-wiper is attached to the middle of it.
For fist quarter, the flat edge is always closest to earth. Presumably for last or second quarter it is always flat edge up? In this case, as it was late afternoon, the moon was half way from the high point (mid-heaven) to the western horizon. You could almost see the arc it had travelled, it was that easy to imagine it.
From my point of view the line from somewhere behind my head to the moon, anywhere on its course that day, was like the top half of a cone. Someone stranded in Hawaii by the European air traffic chaos, would be looking up at the same sight, some 12 hours later, seeing the other side of the cone.
One more thing.
It can be difficult to explain the declination of the moon and sun. We know that it gets colder in northern climes because the declination of the sun is low in winter. The reason why it rises so late and sets so early is because the size of the arc of that conic section is so much smaller in winter.
But for the moon the size of that arc changes daily. Yesterday it seemed quite a large arc (I haven't checked the declinations) in two week's time though the arc will be much smaller.
Here is a depiction of the lunar declinations for 2006 from the Wikipedia:
Just to show you what sort of an expert I am:
Until today I had assumed that the Lunar Nodes were the tips of the curves. The highest and lowest points. It turns out they are the middle points, the parts around the zero mark.
Can you believe that?
What a plonker!
They are the equivalent of equinox not solstices.
Well I've learned something.
I don't know about you?