Three appropriate relationships for determining the solar azimuth angle with respect to the south direction were considered for giving some comments on the available algorithms for solar azimuth angle calculation. The application of each of the trigonometric functions (sin gamma(s), cos gamma(s) and tan gamma(s), where gamma(s) is the solar azimuth) for determining gamma(s) is discussed with regard to the simplicity and generality. It was found that cosy, could be modified in a very simple way in order to be general in determining the solar azimuth angle all over the year. The modified cosy, was compared with those available in literature formulas and formulations with regard to the generality and simplicity. A comparison with available results is provided. (C) 2018 Elsevier Ltd. All rights reserved.