Hi Ken, I use the 4 year average values from Waugh. When I originally designed the Spectra in 2001 that was the best resource available to me, but there are many applications now that you can use to check the values. Orologi Solari is very good for lots of reasons, and I use Shadows as well.
There are several Android apps that give EOT too...I like Sol et Umbra, but most if not all the apps I have seen give EOT on a daily basis, I don't think any of them give the whole year at once like you showed. When I made my EOT chart for the Spectra which is common to every dial that I make (longitude correction is added to the hour lines) Tony Moss advised me to create the chart and plot the line myself, and in my case I used Adobe Illustrator to do that. I'm glad I did, as it seemed like a suitable rite of passage for a professional dial maker. I believe you can also use Excel to do it, if a chart is what you need. Hope this helps. I'll bet you could find something on the NASS Repository disk as well. Best, Jim Tallman www.artisanindustrials.com www.spectrasundial.com jtall...@artisanindustrials.com 513-253-5497 This message is being sent remotely as I am currently out of the studio. Please excuse any further delay in response. On Jan 25, 2017, at 7:21 PM, Kenneth R clark <krcl...@embarqmail.com> wrote: I had an error message from AOL Sorry for no subject line and my files were not sent. Let me retry with this account. Hi everyone, I am working on my Equation of Time plaque for my aluminum cross sundial. All the instructions and graphics and EQT will be on an 8 ½” diameter ½” aluminum plate. I do not want to use the standard graph found on many sundials but instead a chart for the whole year, mins and secs, to add or subtract total correction to get watch time. I do not have much room for detailed instructions. I looked at difference sources for the chart and would like to verify the most accurate times to use the four year leap year cycle for a church at 40.1526N, 76.6038W. I have looked at the Solar Noon calculator, Sonne and Shadows-(cannot input decimal degrees?) Are there other sources or spreadsheet programs? I like to convey that sundials are accurate. I envision that a person will wait till the shadow is on a line and the person will know what time it is suppose to be even though this type of sundial may not be design for precision. I made a quick drawing. There will be some type of sun image at the top and a logo at the bottom for the location. The chart in the center is from another project that I did just to see how it would look and if the printing is large enough to read. I would have to change the inputs to standard time for the whole year. I have also attached a picture of the sundial. I just want to know if I am using the right times and would appreciate any comments or suggestions. Thanks very much Ken Clark Elizabethtown, PA https://lists.uni-koeln.de/mailman/listinfo/sundial On Jan 25, 2017, 7:21 PM, at 7:21 PM, Kenneth R clark <krcl...@embarqmail.com> wrote: > >I had an error message from AOL Sorry for no subject line and my files >were not sent. >Let me retry with this account. > > >Hi everyone, > > >I am working on my Equation of Time plaque for my aluminum cross >sundial. All the instructions and graphics and EQT will be on an 8 ½” >diameter ½” aluminum plate. I do not want to use the standard graph >found on many sundials but instead a chart for the whole year, mins and >secs, to add or subtract total correction to get watch time. I do not >have much room for detailed instructions. > > >I looked at difference sources for the chart and would like to verify >the most accurate times to use the four year leap year cycle for a >church at 40.1526N, 76.6038W. I have looked at the Solar Noon >calculator, Sonne and Shadows-(cannot input decimal degrees?) Are there >other sources or spreadsheet programs? > > >I like to convey that sundials are accurate. I envision that a person >will wait till the shadow is on a line and the person will know what >time it is suppose to be even though this type of sundial may not be >design for precision. > > >I made a quick drawing. There will be some type of sun image at the top >and a logo at the bottom for the location. The chart in the center is >from another project that I did just to see how it would look and if >the printing is large enough to read. I would have to change the inputs >to standard time for the whole year. I have also attached a picture of >the sundial. > > >I just want to know if I am using the right times and would appreciate >any comments or suggestions. > > >Thanks very much > > >Ken Clark Elizabethtown, PA > >------------------------------------------------------------------------ > >--------------------------------------------------- >https://lists.uni-koeln.de/mailman/listinfo/sundial
--------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
