Tom Laidlaw wrote:
Hi there,
I'm trying to resolve what seems like a conflict of information. Some
resources say that a vertical dial is simply a horizontal dial rotated 180
degrees. But when I used Hristov's spreadsheets the calculated angles are
different. Which is correct? Or what am I
Try this experiment:
Draw a circle that represents the earth and
draw a vertical line through it for the
polar axis.
At 45 N latitude, draw the profile of a vertical
dial. At 45 S, draw the profile of a horizontal
dial. You will see that they are in the exact
same orientation with respect to
Original Message
Subject:Re: Polar sundials
Date: Sat, 19 Jun 2010 14:15:53 +0100
From: Frank Evans frankev...@zooplankton.co.uk
To: kool...@dickkoolish.com
Greetings, fellow dialists,
More universally, imagine a point on the earth's surface ninety degrees
A horizontal dial, with no longitude correction, matches a vertical dial, with
no longitude correction, BUT for co-latitude.
If longitude correction is added, then the correction is opposite.
And the shadow moves clockwise on one, counter clockwise on the other.
The attachment is only 30K, it
