Also note that Romania at time was still using the Julian calendar, they did not switch to the Gregorian calendar until 1919.
Rob van Gent From: sundial <[email protected]> On Behalf Of Dan-George Uza Sent: Fri 09 August 2019 12:59 To: Kevin Karney <[email protected]> Cc: Sundial List <[email protected]> Subject: Re: Sunrise/sunset in old calendars/almanacs Dear Kevin, The calendar is old Romanian using cyrillic writing. [sun.jpg] Sunrise/sunset and day length is given on a monthly basis (perhaps average, perhaps middle of the month?). I don't have noon times, that's why I suspect true solar time. Dan On Fri, Aug 9, 2019 at 1:37 PM Kevin Karney <[email protected]<mailto:[email protected]>> wrote: Dan What language was the calendar in? That's a first step to get the latitude. Was the time of sunrise/sunset by day or by month average? Was the time midnight-to-sunrise and midnight-to-sunset equal for each measurement? That would indicate if the calendar was using solar or mean time. N.B. in 1783, France was still using solar time (or so I think) while Britain had, by then, generally shifted to local mean time - the transition was slow. An interesting little problem. By 1793, the knowledge of astronomy was very advanced in many European countries. Let me know if you want help with a number-crunch. I have all the necessary routines in Python and could try every possible combination with little difficulty.... Bear wishes Kevin -- Dan-George Uza
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