Hi Walter (Hope you don't mind if I cc Sundial List) Ok- I'll try to describe it.
Finding Wall Declination using Google Earth 1. Download and install the latest version of Google Earth which has clearer and better images. See: http://earth.google.com/ 2. Open GE and find the location. Zoom in or out to get the clearest view of the wall or roofline. Make sure North (the "N" on the compass) is straight up. 3. Click on "File" then "Save" then "Save Image". An Explorer window appears. Give it a name and save it as a .jpg in your files. 4a. If you don't have a CAD program, then print the photo on a piece of paper. 4b. If you do have a CAD program (I use DeltaCAD), then import the photo into it. 5. Draw a line over the photo of the wall or the roof line above the wall that will have the sundial. 6. Draw a north-south line that intersects the wall or roof line. 6a. If using a paper print, measure the angle of declination (degrees East or West of South) of the wall or roof line, using a protractor. 6b. If using CAD, measure the angle of declination by using the angle dimension tool. Done! p.s. There is another Satellite image website that sometimes has better satellite images than Google Earth. It's called "Bing Maps" (formerly call Virtual Earth). See: http://www.bing.com/maps/?FORM=ZZLH8# Use it the same way as Google Earth. -----Original Message----- From: Walter Sanford [mailto:[email protected]] Sent: Wednesday, June 24, 2009 2:35 PM To: John Carmichael Subject: Google Method Can you explain the "Google method" for finding declination? I can imagine how the process works. Question is, what are the exact steps YOU follow? I wrote to Jim Tallman; he sent a *long* reply I'm going to read right after posting this one. ================================================================= Walter Sanford, Director Carl Sandburg Middle School Center for Sky Awareness 8428 Fort Hunt Road Sandburg Planetarium Alexandria, VA 22308 Fairfax County Public Schools Work: 703-799-6169 -6197 (fax) E-mail: [email protected] Home: 703-765-9392 AMS Project ATMOSPHERE Atmospheric Education Resource Agent & Water in the Earth System (WES) Resource Teacher SCSA, Geosystems, & Camp T-Equity - URL: http://www.wsanford.com/ =================================================================
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