diff --git a/public/index.php b/public/index.php
index 806799b..7bd0dd9 100644
--- a/public/index.php
+++ b/public/index.php
@@ -17,6 +17,20 @@ if (!function_exists('fmtLocalTime')) {
 if (!function_exists('azDir')) {
     function azDir(float $az): string { $dirs = ['N','NO','O','SO','S','SW','W','NW']; return $dirs[(int)round($az / 45) % 8]; }
 }
+if (!function_exists('formatDurationHoursMinutes')) {
+    function formatDurationHoursMinutes(int $minutes): string {
+        $minutes = max(0, $minutes);
+        $hours = intdiv($minutes, 60);
+        $restMinutes = $minutes % 60;
+        if ($hours > 0 && $restMinutes > 0) {
+            return sprintf('%d Stunden %d Minuten', $hours, $restMinutes);
+        }
+        if ($hours > 0) {
+            return sprintf('%d Stunden', $hours);
+        }
+        return sprintf('%d Minuten', $restMinutes);
+    }
+}
 
 function idx_tleChecksum(string $line): int
 {
@@ -94,6 +108,7 @@ function buildTleLine2(array $sat, array $tle): string
 
 // Standort und astronomische Daten nur wenn eingeloggt und Standort vorhanden
 $skyData    = null;
+$skyDataNext = null;
 $planetData = null;
 $satData    = null;
 $pyError    = null;
@@ -155,6 +170,26 @@ if ($loggedIn) {
         $raw = json_decode($rawText, true);
         if (is_array($raw) && ($raw['ok'] ?? false)) {
             $skyData = $raw;
+            $nextDate = (new DateTimeImmutable($date, new DateTimeZone($tz)))->modify('+1 day')->format('Y-m-d');
+            $argsNext = [
+                $pythonBin,
+                escapeshellarg($scriptPath),
+                escapeshellarg('sun_moon_rise_set'),
+                escapeshellarg((string)$lat),
+                escapeshellarg((string)$lon),
+                escapeshellarg((string)$elev),
+                escapeshellarg($nextDate),
+                escapeshellarg($tz),
+            ];
+            $cmdNext = implode(' ', $argsNext) . ' 2>&1';
+            $outNext = [];
+            $resultCodeNext = 0;
+            exec($cmdNext, $outNext, $resultCodeNext);
+            $rawTextNext = trim(implode("\n", $outNext));
+            $rawNext = json_decode($rawTextNext, true);
+            if (is_array($rawNext) && ($rawNext['ok'] ?? false)) {
+                $skyDataNext = $rawNext;
+            }
         } else {
             $pyError = $raw['error'] ?? ($rawText !== '' ? $rawText : 'Fehler beim Berechnen der Aufgangszeiten.');
         }
@@ -272,7 +307,19 @@ if ($loggedIn) {
             &mdash; <?= h((new DateTimeImmutable('now', new DateTimeZone($tz)))->format('d.m.Y')) ?>
         </p>
 
-        <?php $ev = $skyData['events'] ?? []; ?>
+        <?php
+        $ev = $skyData['events'] ?? [];
+        $evNext = $skyDataNext['events'] ?? [];
+        $deepSkyStart = (!empty($ev['astro_dusk']['found']) && !empty($ev['astro_dusk']['local_iso']))
+            ? new DateTimeImmutable($ev['astro_dusk']['local_iso'])
+            : null;
+        $deepSkyEnd = (!empty($evNext['astro_dawn']['found']) && !empty($evNext['astro_dawn']['local_iso']))
+            ? new DateTimeImmutable($evNext['astro_dawn']['local_iso'])
+            : null;
+        $deepSkyDurationMinutes = ($deepSkyStart && $deepSkyEnd && $deepSkyEnd > $deepSkyStart)
+            ? (int) floor(($deepSkyEnd->getTimestamp() - $deepSkyStart->getTimestamp()) / 60)
+            : null;
+        ?>
         <div class="card riseset-card">
             <h2>Heute</h2>
             <div class="riseset-grid">
@@ -308,6 +355,27 @@ if ($loggedIn) {
             </div>
         </div>
 
+        <div class="card riseset-card">
+            <h2>Deep Sky</h2>
+            <?php if ($deepSkyDurationMinutes === null): ?>
+                <p class="hint">Keine vollstaendige astronomische Nacht im berechneten Zeitraum.</p>
+            <?php else: ?>
+            <div class="riseset-grid">
+                <span class="riseset-label riseset-main">Beginn</span>
+                <span class="riseset-val riseset-main"><?= h($deepSkyStart->format('H:i')) ?></span>
+                <span class="riseset-val riseset-main"><?= h($deepSkyStart->format('d.m.')) ?></span>
+
+                <span class="riseset-label riseset-main">Ende</span>
+                <span class="riseset-val riseset-main"><?= h($deepSkyEnd->format('H:i')) ?></span>
+                <span class="riseset-val riseset-main"><?= h($deepSkyEnd->format('d.m.')) ?></span>
+
+                <span class="riseset-label riseset-dim">Dauer</span>
+                <span class="riseset-val riseset-dim"><?= h(formatDurationHoursMinutes($deepSkyDurationMinutes)) ?></span>
+                <span class="riseset-val riseset-dim">astronomische Nacht</span>
+            </div>
+            <?php endif; ?>
+        </div>
+
         <?php if ($satError): ?>
         <div class="card riseset-card">
             <h2>☆ Satellit</h2>