dear sundial expert's, I want to build a equatorial sundial with a corrector on the gnomon. Like the one at Cosmos Observatory Lasstrop (there is a picture at http://www.fransmaes.nl/zonnewijzers/welcome-e.htm => Pole style:equatorial => armillary spheres netherlands). I read a view articles how to construct this kind of gnomon (e.g. http://www.mysundial.ca/tsp/analemmic_sundial.html). But still there is question which I can not answer. If I construct an analemma (12:00 UT) for the location (longitude 8° 44' E; latitude 48° 35' N) with the ephemeride from the U.S. Naval Observatory then this analemma is tilted to the right sight and not perpendicularly. What are the right numbers to calculate the gnomon-corrector (include longitude)? 1. y = declination; x = EOT + longitude (15°- 8° 44')*4 2. y = declination; x = azimuth from the ephemeride For clarification, my question is not about trigonometry.
thanks ralf
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