pvlib.solarposition.sun_rise_set_transit_geometric

pvlib.solarposition.sun_rise_set_transit_geometric(times, latitude, longitude, declination, equation_of_time)

Geometric calculation of solar sunrise, sunset, and transit.

Warning

The geometric calculation assumes a circular earth orbit with the sun as a point source at its center, and neglects the effect of atmospheric refraction on zenith. The error depends on location and time of year but is of order 10 minutes.

Parameters:

times : pandas.DatetimeIndex

Corresponding timestamps, must be localized to the timezone for the latitude and longitude.

latitude : float

Latitude in degrees, positive north of equator, negative to south

longitude : float

Longitude in degrees, positive east of prime meridian, negative to west

declination : numeric

declination angle in radians at times

equation_of_time : numeric

difference in time between solar time and mean solar time in minutes

Returns:

sunrise : datetime

localized sunrise time

sunset : datetime

localized sunset time

transit : datetime

localized sun transit time

References

[1] J. A. Duffie and W. A. Beckman, “Solar Engineering of Thermal Processes, 3rd Edition,” J. Wiley and Sons, New York (2006)

[2] Frank Vignola et al., “Solar And Infrared Radiation Measurements,” CRC Press (2012)