Sorry for the mail with no subject: it's because it was an answer to Ken's e-mail. Here is the text again.
The program "Orologi Solari" can provide a table too (as well as a graph in several formats) of the Equation of Time, including or not the longitude difference, as desired. Values are from Gianni Ferrari study, published on the Italian magazine "Orologi Solari" n. 5, where he computed the EoT mean value in the years 2014-2061. >From the same source you can also get an Excel file containing the original Ferrari's table. In my opinion this the best choice for a sundial that will be hopefully used for many years in the future: a 4 years mean value will not give a correct reading after 30 years (have a look at the article for the evaluation of the exact resulting errors). Also note that EoT values are usually computed at 12 AM UTC (this is indeed the case for Orologi Solari) and you should correct them to move to your time zone. Ciao. Gian Casalegno 2017-01-26 1:21 GMT+01:00 Kenneth R clark <krcl...@embarqmail.com>: > 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 > > >
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