The earliest known water clock was invented by Amenemhet at Karnak/Thebes,
Egypt in about 1500 BC. A descendent clock is in the Egyptian Museum in Cairo.
It was used for determining night hours -- recommended for use on cloudy nights
where the stars were not visible. Images are on the Web, see
J. Malecki:
Here is a document on the Global Solar UVI Index with various charts,graphics,
etc.
http://www.ehso.com/ehso3.php?URL=http%3A%2F%2Fwww.unep.org/PDF/Solar_Index_Guide.pdf
Gordon Uber, San Diego, California
J Malecki jgmale...@yahoo.com wrote:
I've never been to Australia
Sarah Schechner and Sundials:
Here is a link to a picture of the Porter sundial, with details of its fate.
http://palomarskies.blogspot.com/2009/04/russell-porters-missing-sundial.html
Gordon Uber
http://palomarskies.blogspot.com/2009/04/russell-porters-missing-sundial.html
Schechner
Sundial List:
The following has more on the current meridian mark, centered in the Oval south
of the White House. It mentions several other meridian centers, including the
White House and U.S. Naval Observatory transit instrument. Map included.
http://www.waymarking.com/waymarks/WMP0D
Gordon
