diff --git a/css/style.css b/css/style.css
index b0cc4f4..b0508c2 100644
--- a/css/style.css
+++ b/css/style.css
@@ -111,6 +111,24 @@ html, body {
   font-weight: 700;
 }
 
+/* ---- portal to SOLARGOD (sibling orrery) ---- */
+.portal-link {
+  display: block;
+  text-align: center;
+  padding: 6px 8px;
+  font-size: 11px;
+  color: var(--dim);
+  text-decoration: none;
+  background: rgba(255, 255, 255, 0.03);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  transition: all 0.15s;
+}
+.portal-link:hover {
+  color: var(--accent);
+  border-color: var(--accent);
+}
+
 /* ---- layer rows ---- */
 #layers {
   display: flex;
diff --git a/index.html b/index.html
index ec3ea21..15c6fdc 100644
--- a/index.html
+++ b/index.html
@@ -23,6 +23,8 @@
       <button id="mode-photo" type="button">Photo</button>
     </div>
     <div id="layers"></div>
+    <a id="solargod-link" class="portal-link" href="http://127.0.0.1:8147/"
+       target="_blank" rel="noopener" title="Open SOLARGOD at this moment">🪐 SOLARGOD</a>
     <footer>
       <div>Public OSINT feeds · Celestrak · OpenSky · EOX Sentinel-2 · CARTO/OSM</div>
       <div class="demo">Ships &amp; events are <b>[DEMO]</b> data</div>
diff --git a/js/main.js b/js/main.js
index cd80155..7f7845f 100644
--- a/js/main.js
+++ b/js/main.js
@@ -74,6 +74,11 @@ function setMode(mode) {
 document.getElementById('mode-data').addEventListener('click', () => setMode('data'));
 document.getElementById('mode-photo').addEventListener('click', () => setMode('photo'));
 
+// ---- portal to SOLARGOD (sibling orrery) ----
+// Deep-links to the solar-system app at GODSIGH's current sim moment via its
+// shared `#t=@<unixMs>` convention; the href is rebuilt fresh at click time.
+ui.wireSolargodLink(() => Cesium.JulianDate.toDate(viewer.clock.currentTime).getTime());
+
 // ---- clock configuration ----
 viewer.clock.startTime = start.clone();
 viewer.clock.stopTime = stop.clone();
diff --git a/js/ui.js b/js/ui.js
index 0bf14f8..a609f47 100644
--- a/js/ui.js
+++ b/js/ui.js
@@ -111,6 +111,19 @@ export function setLiveChip(isLive) {
   chip.dataset.state = isLive ? 'live' : 'scrub';
 }
 
+// Portal to SOLARGOD (sibling orrery). `getMs` returns GODSIGH's current sim
+// time as unix ms; we rebuild the deep-link href fresh at click time so the
+// orrery opens at whatever moment the clock is scrubbed to, via the shared
+// `#t=@<unixMs>` hash convention. pointerdown fires before navigation, so this
+// also covers ⌘/ctrl-click and middle-click new-tab opens.
+export function wireSolargodLink(getMs) {
+  const a = document.getElementById('solargod-link');
+  if (!a) return;
+  const sync = () => { a.href = `http://127.0.0.1:8147/#t=@${getMs()}`; };
+  a.addEventListener('pointerdown', sync);
+  a.addEventListener('click', sync);
+}
+
 // Small fixed overlay for primitive picks (aircraft), which have no Cesium InfoBox.
 export function showPickOverlay(title, rowPairs) {
   const el = document.getElementById('pick-overlay');