The Italian hours are identical to the Babylonian ones; on any given day, the Sun is at nearly the same altitude (which is what the Soda Can Dial is measuring) one hour after sunrise as it is one hour before sunset (and at two hours, three hours, etc.).
-----Original Message----- From: Roger Bailey [mailto:[EMAIL PROTECTED] Sent: Thursday, October 26, 2006 12:48 PM To: Edley McKnight; Lufkin, Brad (Mission Systems); Sundial Mailing List Subject: RE: Portable Dial Adjusted for EOT and DST -----Original Message----- <On the Babylonian and Italian hours you add 6 if necessary? <Edley McKnight Hello Edley, Italian and Babylonian hours are 6 hours from local time only on the equinox. Italian hours start at sunset; Babylonian hours start at sunrise. Both involve 24 equal hours per day. Since sunrise and sunset times vary through the year, the difference from local time varies as well. See my "Timelines.ppt" presentation, a 16.5 MB file at http://www3.telus.net/public/ormerod/NASSVanRTB/ On Brad's "sodaCan.png", I only see the blue lines for Babylonian hours, with black AM and red PM civil times and no Italian hours. It is interesting how these Babylonian hour lines are fairly flat through much of the year and much of the day, diverging most around the summer solstice and noon. Not surprising when you think about it, the altitude of the sun being fairly constant at a given time after sunrise. This is the benefit of concepts like this. They get you to "think about it". Thanks Brad, for the challenge. Roger Bailey Walking Shadow Designs N 48.7 W 123.4 --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
