Add error handling for moon position calculation

index.html

@@ -364,6 +364,7 @@
         }
 
         function getMoonPosition(now, moonTimes) {
+            try {
                 var rise = moonTimes.rise;
                 var set = moonTimes.set;
 
@@ -380,7 +381,6 @@
                 }
 
                 if (!isVisible) {
-                // Below horizon - position based on current time (grayed out)
                     return { point: pointOnCircle(now, MOON_ORBIT_RADIUS), isVisible: false };
                 }
 
@@ -390,7 +390,6 @@
 
                 // Calculate the angular difference (could be negative if crossing midnight)
                 var diff = setAngle - riseAngle;
-            // Normalize so we take the "shorter" path that matches the moon arc
                 if (diff > Math.PI) diff -= 2 * Math.PI;
                 if (diff < -Math.PI) diff += 2 * Math.PI;
 
@@ -416,6 +415,9 @@
                     },
                     isVisible: true
                 };
+            } catch (e) {
+                return { point: pointOnCircle(now, MOON_ORBIT_RADIUS), isVisible: false };
+            }
         }
 
         function renderMoonPhaseIcon(phase) {
@@ -538,8 +540,15 @@
 
             // Moon position - interpolated between moonrise and moonset on the orbit
             var moonPos = getMoonPosition(now, moonTimes);
+            if (!moonPos || !moonPos.point || isNaN(moonPos.point.x) || isNaN(moonPos.point.y)) {
+                // Fallback to current time position
+                var fallbackP = pointOnCircle(now, MOON_ORBIT_RADIUS);
+                rpgMoon.setAttribute('transform', 'translate(' + fallbackP.x + ', ' + fallbackP.y + ')');
+                rpgMoon.setAttribute('opacity', '0.35');
+            } else {
                 rpgMoon.setAttribute('transform', 'translate(' + moonPos.point.x + ', ' + moonPos.point.y + ')');
                 rpgMoon.setAttribute('opacity', moonPos.isVisible ? '1' : '0.35');
+            }
 
             // Sun rise/set arrows
             var srP = pointOnCircle(sunTimes.sunrise, SUN_ORBIT_RADIUS);