If you're looking for software libraries, I've been happy using these: > AA+ is a C++ implementation for the algorithms as presented in the book > "Astronomical Algorithms" by Jean Meeus.
http://www.naughter.com/aa.html On Aug 24, 2011, at 9:24 AM, David Patte wrote: > If there is a need for someone on the list to generate a programme for > astronomical positions in higher accuracy, I have already coded in C++, > a complete windows library that computes Galactic (GLat/GLng), > Ecliptical (Elat/ELng), Equatorial (Rta/Dec) and Horizontal (Alt/Azi) > positions of the sun, moon, the major planets, comets and asteroids, > given Lat/Lng and Local Time. > > It understand the changing world timezone rules, and uses either > Keplerian or ELP2000/VSOP87 (higher accuracy) methods to get the Rta/Dec > of objects. It also handles precession, nutation, and the aberration and > refraction of light. > > The astronomical engine is used, for example, in our product Time Zone > Master to compute sunrise/set, moon phases, start of seasons, equation > of time, etc., and in Snap Sundial App to compute shadows for a given > lat/lng/Time. > > The code library is available under licence, or I can build code on top > of it, if it is required for a particular project. > > David > --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
