diff --git a/public/sonnenfinsternis.php b/public/sonnenfinsternis.php
index d55acce..3d7230a 100644
--- a/public/sonnenfinsternis.php
+++ b/public/sonnenfinsternis.php
@@ -690,7 +690,9 @@ function drawLocalView() {
 
   const sunR = R;
   const moonR = geo.moonAngR * sc;
-  const mx = cx + geo.dx * sc;
+  // Sky-view perspective is mirrored horizontally relative to the
+  // east-positive topocentric offset used in the geometry calculation.
+  const mx = cx - geo.dx * sc;
   const my = cy + geo.dy * sc;
 
   const glow = ctx.createRadialGradient(cx, cy, sunR * 0.9, cx, cy, sunR * 2.2);