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
