Schaldach wrote: > Dear Frank, > we should recognized that sundials were found from Hellenistic and Roman > times with polar-oriented gnomons.
Yes, I can confirm this. I found a complete horizontal sundial (unknowed to Gibbs catalogue) from Pompei, on 2005. This have temporary hours and an original polar gnomon. But the question is about the first use of the polar gnomon with the equal hours in Europe around the XIVth century. I have a manuscript written at the end of 1300 showing the construction of the horizontal, vertical, east ad west sundials with the Equal hours. I don't know yet if the gnomon used is polar of not, but this is a confirm of the use of astronomical hours on the sundials ad the end of 1300. Best regards Nicola Severino http://www.nicolaseverino.it --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
