I have started this project. I found that a simple lipstick mirror secured to a decorative molding piece anchored mid-way within the window frame works best.
If you are not doing the mathematical calculations (and simply marking the ceiling over a year's time), then keep in mind that there are only truly four days in which "sun time" is equal to "clock time" (see this link for an explanation of the equation of time -- http://www.sundials.co.uk/equation.htm). If the four days are cloudy, then remember to incorporate the time variances if marked on another day (also remember about "daylight savings"). Might I suggest a great book (which I own) -- "Sundials, their Theory and Construction" (see http://www.amazon.de/exec/obidos/ASIN/0486229475/danielroth/302-7766076-4139 267). If gives complete information on the "variance" tables and even how to calculate for a ceiling sundial. Happy Sundialing! Judy Romano -----Original Message----- From: Brooke Clarke [mailto:[EMAIL PROTECTED] Sent: Thursday, February 03, 2005 3:07 PM Cc: Sundial List Subject: Ceiling Dial? Hi: Some months ago I started marking the ceiling to show when I get satellite outage. I have since been making dots on the ceiling and noting the time and date. Today, 3 Feb. 2005 the Sun at 12:00:00 noon was at the same place it was on 6 Nov. 2004 and if I read my writing correctly at 11:30:00. I'm located at 39:11:24.6 North, 123:09:50 West. Can someone check the Sun's position on these two dates and times? At some point in the future I might be able to measure the location or relative location of the marked points and knowing the dates and times do a best fit to determine the room and mirror geometry. Has anyone done this? Thanks, Brooke Clarke, N6GCE -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com - -
