public function setConf(
        $sch = 'Shafi', $sunriseArc = -0.833333, $ishaArc = -17.5, 
        $fajrArc = -19.5, $view = 'Sunni'
    ) {
        $sch = ucfirst($sch);
        
        if ($sch == 'Shafi' || $sch == 'Hanafi') {
            $this->school = $sch;
        }
        
        if (is_numeric($sunriseArc) && $sunriseArc >= -180 && $sunriseArc <= 180) {
            $this->AB2 = $sunriseArc;
        }
        
        if (is_numeric($ishaArc) && $ishaArc >= -180 && $ishaArc <= 180) {
            $this->AG2 = $ishaArc;
        }
        
        if (is_numeric($fajrArc) && $fajrArc >= -180 && $fajrArc <= 180) {
            $this->AJ2 = $fajrArc;
        }
        
        if ($view == 'Sunni' || $view == 'Shia') {
            $this->view = $view;
        }
        
        return $this;
    }