Convert to radians in model

common/utils/dt_model.c

@@ -63,16 +63,16 @@ struct dt_model_params *params = &dt_model_default;
 double dt_model_azimuth_delta(double az, double el)
 {
 	double delta_az;
-	double c1_div_cos_el = params->c1 / cos(el);
-	
+	double c1_div_cos_el = params->c1 / cos(2*M_PI*el/360.);
+
 	if (isnan(c1_div_cos_el))
 		c1_div_cos_el = 0.0;
 	
 	delta_az = 
 	    params->a0 
-	    + params->c1 / cos(el) 
-	    - params->c2 * tan(el) 
-	    - params->za * sin(az - params->aa) * tan(el);
+	    + params->c1 / cos(2*M_PI*el/360.)
+	    - params->c2 * tan(2*M_PI*el/360.)
+	    - params->za * sin(az - params->aa) * tan(2*M_PI*el/360.);
 
 	return delta_az;
 }
@@ -89,9 +89,9 @@ double dt_model_elevation_delta(double az, double el)
 
 	delta_el =
 	     params->e0 
-	     + params->b * cos(el) 
-	     - params->za * cos(az - params->aa);
-	
+	     + params->b * cos(2*M_PI*el/360.)
+	     - params->za * cos(2*M_PI*(az - params->aa)/360.);
+
 	return delta_el;
 }