Hi I got following results from the link http://www.roman-britain.org/astronomy/astro.htm# which I believe is trustworthy
azimuth=200.7233 (20.7233 if south is the zeropoint) altitude= 39.1827 I also tested the results with my own semi-accurate PcAllakka with following results azimuth=200.715 and altitude=39.188 Anyone interested can load the program from http://pc-calculator.110mb.com/allakka/ or perhaps some of you is curious enough to visit my solar tracking sundial pages at http://pc-calculator.110mb.com/tracker/solartracker.html Greetings Aimo Niemi 2010/3/3 John Goodman <[email protected]> > If anyone needs to make precise solar position calculations, the following > software may be useful. There are a few caveats. The software is not a > stand-alone application, it's a software library. The software library needs > to be used from the command line and it runs using the Python programming > language. > > I'm a Mac user and this is one of those rare occasions when an arcane set > of requirements actually favors the Mac. While Macintosh users tend to be > allergic to the command line, it has existed in the OS for the past 10 > years. Python is there too, lurking under the surface. > > I don't know enough about the PC, but clearly the command line is there and > Python is available too. ( http://www.python.org/download/windows/ ) > > With all that preface, here's what the code can do. Once the necessary > files are installed, you can type the following commands and see the > following results: > > >>> import datetime, solar > >>> d = datetime.datetime(2010, 3, 3, 18, 0, 0) > >>> lat = 42.0 > >>> long = -71 > >>> solar.GetAltitude(lat, long, d) > 39.203509044804704 > >>> solar.GetAzimuth(lat, long, d) > -20.717667802423591 > >>> > > Someone with an ephemeris can check these results. The format for datetime > is "yyyy, mm, dd, hh, mm, ss", optionally followed by a number of > microseconds. The time value entered is for UTC. > > There are other functions for calculations that I haven't explored. You can > read more about the software tools at http://pysolar.org/ Example uses > are shown at http://wiki.github.com/pingswept/pysolar/examples The > software itself is at http://github.com/pingswept/pysolar/downloads > > All of this software is the work of Brandon Stafford, who has generously > offered his code free of charge to anyone who may find it useful. I have > little experience with this software but, as much as I can, I'll be happy to > help anyone trying to use it. > > If there are any questions, I can pass them on to Brandon. I hope this is > helpful to some. > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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