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Aug 2, 2025
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Update spa_python doc string #2523

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Update spa_python doc string
AdamRJensen Aug 1, 2025
b2f74ca
Update pvlib/solarposition.py
AdamRJensen Aug 1, 2025
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21 changes: 11 additions & 10 deletions pvlib/solarposition.py
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Expand Up @@ -285,7 +285,7 @@ def spa_python(time, latitude, longitude,
Calculate the solar position using a python implementation of the
NREL SPA algorithm.

The details of the NREL SPA algorithm are described in [1]_.
The details of the NREL SPA algorithm are described in [1]_, [2]_.

If numba is installed, the functions can be compiled to
machine code and the function can be multithreaded.
Expand Down Expand Up @@ -328,25 +328,26 @@ def spa_python(time, latitude, longitude,
-------
DataFrame
The DataFrame will have the following columns:
apparent_zenith (degrees),
zenith (degrees),
apparent_elevation (degrees),
elevation (degrees),
azimuth (degrees),
equation_of_time (minutes).

- apparent_zenith (degrees),
- zenith (degrees),
- apparent_elevation (degrees),
- elevation (degrees),
- azimuth (degrees),
- equation_of_time (minutes).

References
----------
.. [1] I. Reda and A. Andreas, Solar position algorithm for solar
radiation applications. Solar Energy, vol. 76, no. 5, pp. 577-589, 2004.
:doi:`10.1016/j.solener.2003.12.003`.

.. [2] I. Reda and A. Andreas, Corrigendum to Solar position algorithm for
solar radiation applications. Solar Energy, vol. 81, no. 6, p. 838,
2007.
2007. :doi:`10.1016/j.solener.2007.01.003`.

.. [3] USNO delta T:
https://maia.usno.navy.mil/products/deltaT
.. [3] `USNO delta T:
<https://maia.usno.navy.mil/products/deltaT>`_

See also
--------
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