diff --git a/index.html b/index.html
index 2ab5a60..632c674 100644
--- a/index.html
+++ b/index.html
@@ -327,7 +327,7 @@
             <div class="info-icon">
                 <svg id="moon-phase-icon" viewBox="0 0 24 24"><circle cx="12" cy="12" r="9" fill="#1c1b1f"/></svg>
             </div>
-            <div class="info-content"><span class="info-label">Mondphase</span><span class="info-value" id="moon-phase-text">--</span></div>
+            <div class="info-content"><span class="info-label">Mondphase</span><span class="info-value" id="moon-phase-text">--</span><span id="dbg-test" style="color:red"></span></div>
         </div>
         <div class="info-row">
             <div class="info-icon">
@@ -913,6 +913,10 @@ if (moonTimes.set) {
             var moonZenithWhen = moonZenith && moonZenith > now ? formatDateLong(moonZenith) : '';
             document.getElementById('moon-zenith-value').textContent = moonZenith ? formatTimeHM(moonZenith) : '--:--';
             document.getElementById('moon-zenith-when').textContent = moonZenithWhen ? '· ' + moonZenithWhen : '';
+            var dbgEl = document.getElementById('dbg-test');
+            if (dbgEl) {
+                dbgEl.textContent = 'moon-zenith: ' + (moonZenith ? formatTimeHM(moonZenith) : 'none') + ' visible: ' + moonVisible;
+            }
             } catch (e) {
                 console.log('updateClock error:', e);
             }