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--- Begin Message ---Dear Michael, I don’t know how it work the English language with the latin because we read Analemma in English and in Latin but the meaning is a lot different in bot languages. In Latin is the geometrical projection that let you make sundials (see Vitruvius and Ptolemy), for English is the 8 shaped figure of the equation of time. And so Temporal hours too. In old Italian latin books the seasonal hours take the name of “temporal” fron the latin “tempora” (plural) that are the seasons (the four “tempora”). Hope I made clear the mystery. Mario From: Michael Ossipoff Sent: Thursday, May 02, 2019 11:44 PM To: Cc: Subject: Re: Temporal hours to modern hours That sounds like just a conversion between two ways of naming the equal-hours. ...converting between the.modern 12-hour naming, and a numbering that calls the hour from 6 a.m. to 7 a.m. the 1st hour. It doesn't take into account the different lengths of the hours, which depend on the varying length of the day, because the sunrise-sunset day is divided into 12 equal parts (as is the sunset-sunrise night). I don't agree with the term "temporal hours". The first book that I found that mentioned seasonal-hours called them "temporary hours". That name makes sense, because the length of an hour is temporary instead of constant, because it varies with the season. "Temporal hours" doesn't make sense, because all hours are temporal. "Temporal" just means "of, about or pertaining to time". Maybe a good term would be "seasonal-hours", because their length varies seasonally. One way to get temporary-hours is from Babylonian and co-Italian hours. Divide the Babylonian hour from the sum of the Babylonian hour and the co-Italian hour. Michael Ossipoff 19 Th (Thursday of the 19th week of the calendar-year that started with the Monday that started closest to the South-Solstice. ...or closest to the approximation to the South-Solstice, based on the assumption that a South-Solstice occurs exactly every 365.2422 days, starting from the actual South-Solstice of 2017). (The South-Sostice of 2017 occurred at December 21.686 ...where the time of day is expressed as a fraction of the day from midnight of that day.) ... On Thu, May 2, 2019 at 5:05 PM Dan-George Uza <[email protected]> wrote: Hello, In a note quoted below from the "Dictionary of Greek and Roman Antiquities, John Murray, London, 1875" I found the following advice to convert temporal hours to modern hours. "A very quick and easy rule of thumb, when we read "the third hour, the sixth hour", etc., is to add 3, 6, etc. to 5:00 A.M.: The first hour, for example, runs from roughly 6 to roughly 7 A.M.; and the ninth hour from roughly 2 to roughly 3 P.M." Source: http://penelope.uchicago.edu/Thayer/E/Roman/Texts/secondary/SMIGRA*/Hora.html Of course back then there was no summer time either... But is there a closer aproximation for this, perhaps using a simple mathematical formula? Are there apps that can convert temporal hours directly to modern equivalents, perhaps as a spreadsheet? Dan Uza --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial -------------------------------------------------------------------------------- --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial --- Questa e-mail è stata controllata per individuare virus con Avast antivirus. https://www.avast.com/antivirus
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