pvlib.spa.transit_sunrise_sunset

pvlib.spa.transit_sunrise_sunset(dates, lat, lon, delta_t, numthreads)

Calculate the sun transit, sunrise, and sunset for a set of dates at a given location using the NREL SPA.

The NREL SPA is documented in [1], [2].

Parameters:

• dates (array) – Numpy array of ints/floats corresponding to the Unix time for the dates of interest, must be midnight UTC (00:00+00:00) on the day of interest.

• lat (float) – Latitude of location to perform calculation for

• lon (float) – Longitude of location

• delta_t (float or array) – Difference between terrestrial time and UT. USNO has tables.

• numthreads (int) – Number to threads to use for calculation (if using numba)

Returns:

tuple ((transit, sunrise, sunset) localized to UTC)

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 76 (2004) 577–589] Solar Energy, vol. 81, no. 6, pp. 838, 2007. DOI: 10.1016/j.solener.2007.01.003