///////////////////////////////////////////////////////////////////////////////////////////
// Calculate all SPA parameters and put into structure
// Note: All inputs values (listed in header file) must already be in structure
///////////////////////////////////////////////////////////////////////////////////////////
void spa_calculate(spa_data *spa)
{
spa->jd = julian_day (spa->year, spa->month, spa->day,
spa->hour, spa->minute, spa->second, spa->timezone);
calculate_geocentric_sun_right_ascension_and_declination(spa);
spa->h = observer_hour_angle(spa->nu, spa->longitude, spa->alpha);
spa->xi = sun_equatorial_horizontal_parallax(spa->r);
sun_right_ascension_parallax_and_topocentric_dec(spa->latitude, spa->elevation, spa->xi, spa->h,
spa->delta, &(spa->del_alpha), &(spa->delta_prime));
spa->alpha_prime = topocentric_sun_right_ascension(spa->alpha, spa->del_alpha);
spa->h_prime = topocentric_local_hour_angle(spa->h, spa->del_alpha);
spa->e0 = topocentric_elevation_angle(spa->latitude, spa->delta_prime, spa->h_prime);
spa->del_e = atmospheric_refraction_correction(spa->pressure, spa->temperature, spa->e0);
spa->e = topocentric_elevation_angle_corrected(spa->e0, spa->del_e);
spa->zenith = topocentric_zenith_angle(spa->e);
spa->azimuth180 = topocentric_azimuth_angle_neg180_180(spa->h_prime, spa->latitude,
spa->delta_prime);
spa->azimuth = topocentric_azimuth_angle_zero_360(spa->azimuth180);
spa->incidence = surface_incidence_angle(spa->zenith, spa->azimuth180, spa->azm_rotation,
spa->slope);
spa->altitude = 90.0 - spa->incidence; //**KMB
calculate_eot_and_sun_rise_transit_set(spa);
}
///////////////////////////////////////////////////////////////////////////////////////////
// Calculate all SPA parameters and put into structure
// Note: All inputs values (listed in header file) must already be in structure
///////////////////////////////////////////////////////////////////////////////////////////
int spa_calculate(spa_data *spa)
{
int result;
result = validate_inputs(spa);
if (result == 0)
{
spa->jd = julian_day (spa->year, spa->month, spa->day,
spa->hour, spa->minute, spa->second, spa->timezone);
calculate_geocentric_sun_right_ascension_and_declination(spa);
spa->h = observer_hour_angle(spa->nu, spa->longitude, spa->alpha);
spa->xi = sun_equatorial_horizontal_parallax(spa->r);
sun_right_ascension_parallax_and_topocentric_dec(spa->latitude, spa->elevation, spa->xi,
spa->h, spa->delta, &(spa->del_alpha), &(spa->delta_prime));
spa->alpha_prime = topocentric_sun_right_ascension(spa->alpha, spa->del_alpha);
spa->h_prime = topocentric_local_hour_angle(spa->h, spa->del_alpha);
spa->e0 = topocentric_elevation_angle(spa->latitude, spa->delta_prime, spa->h_prime);
spa->del_e = atmospheric_refraction_correction(spa->pressure, spa->temperature,
spa->atmos_refract, spa->e0);
spa->e = topocentric_elevation_angle_corrected(spa->e0, spa->del_e);
spa->zenith = topocentric_zenith_angle(spa->e);
spa->azimuth180 = topocentric_azimuth_angle_neg180_180(spa->h_prime, spa->latitude,
spa->delta_prime);
spa->azimuth = topocentric_azimuth_angle_zero_360(spa->azimuth180);
if ((spa->function == SPA_ZA_INC) || (spa->function == SPA_ALL))
spa->incidence = surface_incidence_angle(spa->zenith, spa->azimuth180,
spa->azm_rotation, spa->slope);
if ((spa->function == SPA_ZA_RTS) || (spa->function == SPA_ALL))
calculate_eot_and_sun_rise_transit_set(spa);
}
return result;
}