diff --git a/static/css/globe.css b/static/css/globe.css
index ef66001..c46370b 100644
--- a/static/css/globe.css
+++ b/static/css/globe.css
@@ -574,3 +574,6 @@ html, body { height: 100%; overflow: hidden; background: var(--bg-primary); colo
 .dot-cables { background: #00ccff; }
 .dot-infra { background: #ffdd00; }
 .dot-iss { background: #ff4444; box-shadow: 0 0 6px rgba(255,68,68,0.6); }
+
+.dot-terminator { background: #ff8800; }
+.dot-timezones { background: #8888ff; }
diff --git a/static/index.html b/static/index.html
index db8075b..12d822a 100644
--- a/static/index.html
+++ b/static/index.html
@@ -132,6 +132,16 @@
                 <span class="layer-dot dot-daynight"></span>
                 <span class="layer-name" title="Sonnenlicht-Simulation zeigt aktuelle Tages-/Nachtseite">Tag/Nacht</span>
             </label>
+            <label class="layer-toggle">
+                <input type="checkbox" id="layer-terminator" title="Echtzeit Tag/Nacht-Grenze als orange Linie + Nachtschatten">
+                <span class="layer-dot dot-terminator"></span>
+                <span class="layer-name" title="Sonnenterminatur: Grenze zwischen Tag und Nacht">Terminatur</span>
+            </label>
+            <label class="layer-toggle">
+                <input type="checkbox" id="layer-timezones" title="24 Zeitzonen-Linien mit aktueller Uhrzeit">
+                <span class="layer-dot dot-timezones"></span>
+                <span class="layer-name" title="UTC-Zonen als vertikale Linien mit Uhrzeiten">Zeitzonen</span>
+            </label>
             <label class="layer-toggle">
                 <input type="checkbox" id="layer-crosshairs" title="Fadenkreuz und Entfernungsringe">
                 <span class="layer-dot dot-crosshairs"></span>
@@ -228,6 +238,8 @@
     <script src="/static/js/layers/cables.js"></script>
     <script src="/static/js/layers/infra.js"></script>
     <script src="/static/js/layers/iss.js"></script>
+    <script src="/static/js/layers/terminator.js"></script>
+    <script src="/static/js/layers/timezones.js"></script>
     <script src="/static/js/layers/weather.js"></script>
     <script src="/static/js/ui/imagery.js"></script>
     <script src="/static/js/ui/search.js"></script>
diff --git a/static/js/app.js b/static/js/app.js
index 231eed8..c286122 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -163,6 +163,8 @@ const Globe = {
             'layer-disasters': function(on) { on ? DisastersLayer.start(Globe.viewer) : DisastersLayer.stop(); },
             'layer-weather': function(on) { on ? WeatherLayer.start(Globe.viewer) : WeatherLayer.stop(); },
             'layer-daynight': function(on) { Globe.viewer.scene.globe.enableLighting = on; },
+            'layer-terminator': function(on) { on ? TerminatorLayer.start(Globe.viewer) : TerminatorLayer.stop(); },
+            'layer-timezones': function(on) { on ? TimezonesLayer.start(Globe.viewer) : TimezonesLayer.stop(); },
             'layer-crosshairs': function(on) { CrosshairsUI.toggle(on); },
             'layer-labels': function(on) { Globe._toggleLabels(on); },
         };
diff --git a/static/js/layers/terminator.js b/static/js/layers/terminator.js
new file mode 100644
index 0000000..adb6348
--- /dev/null
+++ b/static/js/layers/terminator.js
@@ -0,0 +1,91 @@
+/**
+ * Sonnenterminatur: Echtzeit Tag/Nacht-Grenze als Linie + Nachtflaeche.
+ */
+const TerminatorLayer = {
+    _viewer: null,
+    _entity: null,
+    _line: null,
+    _interval: null,
+    _count: 0,
+
+    start(viewer) {
+        if (this._entity) return;
+        this._viewer = viewer;
+        this._render();
+        this._count = 1;
+        var self = this;
+        this._interval = setInterval(function() { self._render(); }, 60000);
+    },
+
+    stop() {
+        if (this._interval) { clearInterval(this._interval); this._interval = null; }
+        if (this._entity && this._viewer) { this._viewer.entities.remove(this._entity); this._entity = null; }
+        if (this._line && this._viewer) { this._viewer.entities.remove(this._line); this._line = null; }
+        this._count = 0;
+    },
+
+    _calcTerminator() {
+        // Sonnenposition berechnen
+        var now = new Date();
+        var dayOfYear = Math.floor((now - new Date(now.getFullYear(), 0, 0)) / 86400000);
+        var declination = -23.45 * Math.cos((360 / 365) * (dayOfYear + 10) * Math.PI / 180);
+        var decRad = declination * Math.PI / 180;
+
+        // Stunden seit Mitternacht UTC
+        var utcHours = now.getUTCHours() + now.getUTCMinutes() / 60 + now.getUTCSeconds() / 3600;
+        var sunLon = -(utcHours - 12) * 15; // Sonnen-Laengengrad
+
+        // Terminatur-Punkte berechnen (Polygon um die Nachtseite)
+        var points = [];
+        var linePoints = [];
+        for (var i = 0; i <= 360; i += 2) {
+            var lon = i - 180;
+            var lonRad = (lon - sunLon) * Math.PI / 180;
+            var lat = Math.atan(-Math.cos(lonRad) / Math.tan(decRad)) * 180 / Math.PI;
+            linePoints.push(lon, lat);
+        }
+
+        // Nacht-Polygon: Terminatur-Linie + Pole
+        var nightPolygon = [];
+        // Oberer Rand (Nordpol oder Suedpol je nach Jahreszeit)
+        var topLat = declination > 0 ? -90 : 90;
+        nightPolygon.push(-180, topLat);
+        for (var j = 0; j < linePoints.length; j += 2) {
+            nightPolygon.push(linePoints[j], linePoints[j + 1]);
+        }
+        nightPolygon.push(180, topLat);
+
+        return { line: linePoints, night: nightPolygon };
+    },
+
+    _render() {
+        if (!this._viewer) return;
+        var data = this._calcTerminator();
+
+        // Alte Entities entfernen
+        if (this._entity) this._viewer.entities.remove(this._entity);
+        if (this._line) this._viewer.entities.remove(this._line);
+
+        // Nachtflaeche (dunkel, halbtransparent)
+        var nightPositions = Cesium.Cartesian3.fromDegreesArray(data.night);
+        this._entity = this._viewer.entities.add({
+            polygon: {
+                hierarchy: new Cesium.PolygonHierarchy(nightPositions),
+                material: Cesium.Color.BLACK.withAlpha(0.35),
+                height: 0,
+                outline: false,
+            },
+        });
+
+        // Terminatur-Linie (leuchtend)
+        var linePositions = Cesium.Cartesian3.fromDegreesArray(data.line);
+        this._line = this._viewer.entities.add({
+            polyline: {
+                positions: linePositions,
+                width: 2,
+                material: Cesium.Color.fromCssColorString('#ff8800').withAlpha(0.6),
+                clampToGround: true,
+            },
+        });
+    },
+};
diff --git a/static/js/layers/timezones.js b/static/js/layers/timezones.js
new file mode 100644
index 0000000..701fce0
--- /dev/null
+++ b/static/js/layers/timezones.js
@@ -0,0 +1,75 @@
+/**
+ * Zeitzonen-Overlay: Vertikale Linien alle 15 Grad + aktuelle Uhrzeit.
+ */
+const TimezonesLayer = {
+    _viewer: null,
+    _primitives: null,
+    _labels: null,
+    _interval: null,
+    _count: 0,
+
+    start(viewer) {
+        if (this._primitives) return;
+        this._viewer = viewer;
+        this._primitives = viewer.scene.primitives.add(new Cesium.PolylineCollection());
+        this._labels = viewer.scene.primitives.add(new Cesium.LabelCollection());
+        this._render();
+        this._count = 24;
+        var self = this;
+        this._interval = setInterval(function() { self._updateLabels(); }, 60000);
+    },
+
+    stop() {
+        if (this._interval) { clearInterval(this._interval); this._interval = null; }
+        if (this._primitives && this._viewer) { this._viewer.scene.primitives.remove(this._primitives); this._primitives = null; }
+        if (this._labels && this._viewer) { this._viewer.scene.primitives.remove(this._labels); this._labels = null; }
+        this._count = 0;
+    },
+
+    _render() {
+        if (!this._primitives) return;
+        var lineColor = Cesium.Color.fromCssColorString('#ffffff').withAlpha(0.08);
+        // 24 Zeitzonen-Linien (alle 15 Grad)
+        for (var tz = -12; tz <= 12; tz++) {
+            var lon = tz * 15;
+            var positions = [];
+            for (var lat = -80; lat <= 80; lat += 10) {
+                positions.push(Cesium.Cartesian3.fromDegrees(lon, lat, 0));
+            }
+            this._primitives.add({
+                positions: positions,
+                width: 1,
+                material: Cesium.Material.fromType('Color', { color: lineColor }),
+            });
+        }
+        this._updateLabels();
+    },
+
+    _updateLabels() {
+        if (!this._labels) return;
+        this._labels.removeAll();
+        var now = new Date();
+        var utcH = now.getUTCHours();
+        var utcM = now.getUTCMinutes();
+
+        for (var tz = -12; tz <= 12; tz++) {
+            var lon = tz * 15;
+            var h = (utcH + tz + 24) % 24;
+            var timeStr = ('0' + h).slice(-2) + ':' + ('0' + utcM).slice(-2);
+            var label = 'UTC' + (tz >= 0 ? '+' : '') + tz + '  ' + timeStr;
+
+            this._labels.add({
+                position: Cesium.Cartesian3.fromDegrees(lon, 0, 0),
+                text: label,
+                font: '10px monospace',
+                fillColor: Cesium.Color.WHITE.withAlpha(0.4),
+                outlineColor: Cesium.Color.BLACK,
+                outlineWidth: 2,
+                style: Cesium.LabelStyle.FILL_AND_OUTLINE,
+                scale: 0.7,
+                horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
+                distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 8000000),
+            });
+        }
+    },
+};