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Hello
Tracy,
Chris
provides some good advice. The center line on the N/S axis is correct. The noon
hour point offset we assume is the longitude correction. This shifts all the
hour points accordingly. Your size, 33 ft major axis is fairly large.
Appropriate for your design perhaps but be aware of the short shadow lengths in
the summer for a person as the gnomon. Also be aware that the normal analemma
shape provides a time correction E/W only. This works for noon but for the
corrections in the N/S direction for other hours, AM and PM go in opposite
directions. Two analemmas and a split dial can provide better correction but
generally this is not worth the effort.
From
your relatively local "palouse.net" email address I wonder if you may
have seen the Skaha Lake analemmatic sundial near Penticton BC. It is billed as
the "Worlds Largest Analemmatic Sundial". In my opinion it is too large and
falls into the "analemma correction for an analemmatic sundial" trap. But it is
a great point of local interest on the beach.
Have
you considered seasonal markers that use the dial to tell when and where the sun
rises and sets throughout the year. I consider these to be a simple and useful
additional feature for analemmatic sundials . Ok, I am biased
but...
There
is some useful information on such things as shadow lengths and seasonal markers
on my fairly primitive personal website http://www3.telus.net/public/rtbailey/
Regards,
Roger
Bailey
Walking Shadow Designs
N
48.6 W 123.4
Sidney
by the Sea, BC
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Tracy Paine Sent: October 26, 2006 5:55 PM To: [email protected] Subject: date scale
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