Hi Edley, You are correct. I missed your statement in parenthesis "( when in the equatorial plane )" and focused on the examples that implied the horizontal plane. You were dealing with the time angle, 15 degrees per hour and not, as I had assumed, the azimuth angle that changes with altitude.
In any case my misunderstanding allowed me to introduce the sunset interval idea. The change in azimuth at sunset is remarkable. We do not normally notice it as the best sunsets are viewed over ocean vistas or horizontal plains lacking fixed points of reference. On memorable sunset for me was in your area, along the Oregon Coast. We were trying to get a picture of the sun setting through an arch in a seamount off Bandon, Oregon. My guess at where to stand to take this picture was way off. As the sun set and moved north, we had to keep moving south to maintain the view through the seamount. Roger Bailey -----Original Message----- From: Edley [mailto:[EMAIL PROTECTED] Sent: December 5, 2001 2:35 AM To: Roger Bailey Cc: [email protected] Subject: RE:RE: Interval Timers? I had slipped in a parenthesis saying it was true in the equatorial plane, and that would be mostly true as you say, except if the sides of the pie were tall and it acted as a shadow plane dial. As you say, at the equator itself you would have to point it straight up in the air and balance it somehow there, and unless it were some very stiff sort of pie it would all run out. Still at higher latitudes, in the days of the guilds, it may have been done regularly, but I only have clues to this effect, no direct proof.
