The Astronomical Almanac's algorithm for approximate solar position (1950 - 2050).

@article{Michalsky1988TheAA,
  title={The Astronomical Almanac's algorithm for approximate solar position (1950 - 2050).},
  author={Joseph J. Michalsky},
  journal={Solar Energy},
  year={1988},
  volume={40},
  pages={227-235}
}
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