“…Knowing the solar constant G sc and the latitude ϕ for the location of each station, the hour angle ω s was determined by the equation ( 2) (Belúcio, et al, 2014;Duffie & Beckman, 1991;Iqbal, 1983;Kumar, 2016) For Vianello and Alves, 1991, considering the chronological time variable H, which varies from 0 to 24 hours (in degrees), the hour angle w s , in the morning and ws<0; at noon w s =0 and in the afternoon ws>0, such that, after calculating the hour angle, taking into account the time (local time converted to solar). Having first, treating the measurement hour with a time interval of 1 (one) and 10 (ten) minutes, that is, minute by minute, then transforming the hour angle into degrees, a worse result was obtained equation ( 3).…”