pvlib.solarposition.spa_c¶
-
pvlib.solarposition.
spa_c
(time, latitude, longitude, pressure=101325, altitude=0, temperature=12, delta_t=67.0, raw_spa_output=False)[source]¶ Calculate the solar position using the C implementation of the NREL SPA code.
The source files for this code are located in ‘./spa_c_files/’, along with a README file which describes how the C code is wrapped in Python. Due to license restrictions, the C code must be downloaded seperately and used in accordance with it’s license.
This function is slower and no more accurate than
spa_python()
.Parameters: - time : pandas.DatetimeIndex
Localized or UTC.
- latitude : float
- longitude : float
- pressure : float, default 101325
Pressure in Pascals
- altitude : float, default 0
Elevation above sea level.
- temperature : float, default 12
Temperature in C
- delta_t : float, default 67.0
Difference between terrestrial time and UT1. USNO has previous values and predictions.
- raw_spa_output : bool, default False
If true, returns the raw SPA output.
Returns: - DataFrame
The DataFrame will have the following columns: elevation, azimuth, zenith, apparent_elevation, apparent_zenith.
See also
References
NREL SPA code: http://rredc.nrel.gov/solar/codesandalgorithms/spa/
USNO delta T: http://www.usno.navy.mil/USNO/earth-orientation/eo-products/long-term