geodata.pv.solar_position.SolarPosition
=======================================

.. py:function:: geodata.pv.solar_position.SolarPosition(ds)

   Compute solar azimuth and altitude

   Solar altitude errors are up to 1.5 deg during sun-rise and set, but at
   0.05-0.1 deg during daytime.

   .. rubric:: References

   [1] Michalsky, J. J., The astronomical almanac’s algorithm for approximate
   solar position (1950–2050), Solar Energy, 40(3), 227–235 (1988).
   [2] Sproul, A. B., Derivation of the solar geometric relationships using
   vector analysis, Renewable Energy, 32(7), 1187–1205 (2007).
   [3] Kalogirou, Solar Energy Engineering (2009).

   More accurate algorithms would be
   ---------------------------------
   [4] I. Reda and A. Andreas, Solar position algorithm for solar
   radiation applications. Solar Energy, vol. 76, no. 5, pp. 577-589, 2004.
   [5] I. Reda and A. Andreas, Corrigendum to Solar position algorithm for
   solar radiation applications. Solar Energy, vol. 81, no. 6, p. 838, 2007.
   [6] Blanc, P., & Wald, L., The SG2 algorithm for a fast and accurate
   computation of the position of the sun for multi-decadal time period, Solar
   Energy, 86(10), 3072–3083 (2012).

   The unfortunately quite computationally intensive SPA algorithm [4,5] has
   been implemented using numba or plain numpy for a single location at
   https://github.com/pvlib/pvlib-python/blob/master/pvlib/spa.py.