added variable to store zenith

src/main.cpp

@@ -29,6 +29,7 @@ typedef struct {
   float latitude;
   float longitude;
   float declination;
+  float zenith;
   float elevation;
   float azimuth;
 } tSolar;
@@ -183,7 +184,8 @@ void loop() {
       sunpos(t, loc, &sunloc);
 
       sun.azimuth = sunloc.dAzimuth;
-      sun.elevation = 90 - sunloc.dZenithAngle;
+      sun.zenith = sunloc.dZenithAngle;
+      sun.elevation = 90 - sun.zenith;
 
       // method 2 - using SolarPosition library
       // sun.elevation = location.getSolarPosition(sun.epoch).elevation;