Tom Anderson wrote:
On Sun, 8 Oct 2006, Richard J. wrote:

Ralph Diehl wrote:

Yes, I abandoned that object for about the same reason.

I'm playinng with the shadow of the tate modern chimney now, it's
a bunch clearer.

The chimneys of Battersea Power Station are also very good.

Somebody said it was about 11am, it's not quite 11:30am according
to the angle I got.

I'm trying to remember the distance down to the river (how many
feet lower the river level is from the base of chimney), it's been
nearly a year since I was last there. (I live about 6K miles away
from it)

The river level varies by up to 7 metres depending on the state of
the tide, so that may not be a good shadow to choose.

Ah, but if we can deduce the height of the tide from a feature on
the Thames, we can correct for that. And we'd have a double-check
on the date and time via the tide tables.

The tide tables won't hwlp much, as they only show the predictions. On
Saturday afternoon (7 Oct) the river was about 0.4 m higher than
predicted at London Bridge, and a metre higher at Richmond.
--
Richard J.
(to e-mail me, swap uk and yon in address)