Fix: add missing moonsetArrow variable declaration

index.html

@@ -550,9 +550,9 @@ var effect = (VANTA.CLOUDS2 || VANTA.CLOUDS)({
         var sunRiseArrow = document.getElementById('sun-rise-arrow');
         var sunSetArrow = document.getElementById('sun-set-arrow');
         var moonRiseArrow = document.getElementById('moon-rise-arrow');
+        var moonsetArrow = document.getElementById('moon-set-arrow');
         var sunZenithMarker = document.getElementById('sun-zenith-marker');
         var moonZenithMarker = document.getElementById('moon-zenith-marker');
-        var moonSetArrow = document.getElementById('moon-set-arrow');
 
         var SUN_ORBIT_RADIUS = 65;
         var MOON_ORBIT_RADIUS = 88;