diff --git a/public/comets.php b/public/comets.php
index eae13a6..ca1820e 100644
--- a/public/comets.php
+++ b/public/comets.php
@@ -479,6 +479,30 @@ arsort($orbitTypeCounts);
     letter-spacing: 0.08em;
 }
 
+.comets-table th[data-sortable] {
+    cursor: pointer;
+    user-select: none;
+    white-space: nowrap;
+}
+
+.comets-table th[data-sortable]::after {
+    content: ' ⇅';
+    opacity: 0.35;
+    font-size: 0.78em;
+}
+
+.comets-table th[data-sortable][data-sort-dir="asc"]::after {
+    content: ' ↑';
+    opacity: 1;
+    color: #c9a84c;
+}
+
+.comets-table th[data-sortable][data-sort-dir="desc"]::after {
+    content: ' ↓';
+    opacity: 1;
+    color: #c9a84c;
+}
+
 .comets-table td {
     color: #eef4ff;
 }
@@ -601,13 +625,13 @@ arsort($orbitTypeCounts);
                 <table class="comets-table">
                     <thead>
                         <tr>
-                            <th>Komet</th>
-                            <th>Typ</th>
-                            <th>RA</th>
-                            <th>Dec</th>
-                            <th>Perihel</th>
-                            <th>Abstand</th>
-                            <th title="Grobe Helligkeitsschaetzung fuer heute nach H + 5 log(Delta) + 2,5 * n * log(r).">m grob</th>
+                            <th data-sortable>Komet</th>
+                            <th data-sortable>Typ</th>
+                            <th data-sortable>RA</th>
+                            <th data-sortable>Dec</th>
+                            <th data-sortable>Perihel</th>
+                            <th data-sortable>Abstand</th>
+                            <th data-sortable title="Grobe Helligkeitsschaetzung fuer heute nach H + 5 log(Delta) + 2,5 * n * log(r).">m grob</th>
                         </tr>
                     </thead>
                     <tbody>
@@ -619,6 +643,7 @@ arsort($orbitTypeCounts);
                                 : ((int) $comet['days_from_today'] === 0
                                     ? 'Heute'
                                     : (((int) $comet['days_from_today'] > 0 ? '+' : '') . (int) $comet['days_from_today'] . ' Tage'));
+                            $perihelionTs = $comet['perihelion_date_object'] instanceof DateTimeImmutable ? $comet['perihelion_date_object']->getTimestamp() : '';
                             ?>
                             <tr>
                                 <td>
@@ -634,11 +659,11 @@ arsort($orbitTypeCounts);
                                     </div>
                                 </td>
                                 <td><?= h((string) $comet['orbit_type_label']) ?></td>
-                                <td><?= h((string) $comet['ra_display']) ?></td>
-                                <td><?= h((string) $comet['dec_display']) ?></td>
-                                <td><?= h((string) $comet['perihelion_date_display']) ?></td>
-                                <td><span class="comets-days <?= $daysClass ?>"><?= h($daysLabel) ?></span></td>
-                                <td title="r = <?= h((string) $comet['heliocentric_distance_display']) ?> AE, Δ = <?= h((string) $comet['geocentric_distance_display']) ?> AE"><?= h((string) $comet['estimated_magnitude_display']) ?></td>
+                                <td data-sort-value="<?= h((string) ($comet['ra_hours'] ?? '')) ?>"><?= h((string) $comet['ra_display']) ?></td>
+                                <td data-sort-value="<?= h((string) ($comet['dec_deg'] ?? '')) ?>"><?= h((string) $comet['dec_display']) ?></td>
+                                <td data-sort-value="<?= h((string) $perihelionTs) ?>"><?= h((string) $comet['perihelion_date_display']) ?></td>
+                                <td data-sort-value="<?= h((string) ($comet['days_from_today'] ?? '')) ?>"><span class="comets-days <?= $daysClass ?>"><?= h($daysLabel) ?></span></td>
+                                <td data-sort-value="<?= h((string) ($comet['estimated_magnitude'] ?? '')) ?>" title="r = <?= h((string) $comet['heliocentric_distance_display']) ?> AE, Δ = <?= h((string) $comet['geocentric_distance_display']) ?> AE"><?= h((string) $comet['estimated_magnitude_display']) ?></td>
                             </tr>
                         <?php endforeach; ?>
                     </tbody>
@@ -657,13 +682,13 @@ arsort($orbitTypeCounts);
                 <table class="comets-table">
                     <thead>
                         <tr>
-                            <th>Komet</th>
-                            <th>Typ</th>
-                            <th>RA</th>
-                            <th>Dec</th>
-                            <th>Perihel</th>
-                            <th>Abstand</th>
-                            <th title="Grobe Helligkeitsschaetzung fuer heute nach H + 5 log(Delta) + 2,5 * n * log(r).">m grob</th>
+                            <th data-sortable>Komet</th>
+                            <th data-sortable>Typ</th>
+                            <th data-sortable>RA</th>
+                            <th data-sortable>Dec</th>
+                            <th data-sortable>Perihel</th>
+                            <th data-sortable>Abstand</th>
+                            <th data-sortable title="Grobe Helligkeitsschaetzung fuer heute nach H + 5 log(Delta) + 2,5 * n * log(r).">m grob</th>
                         </tr>
                     </thead>
                     <tbody>
@@ -675,6 +700,7 @@ arsort($orbitTypeCounts);
                                 : ((int) $comet['days_from_today'] === 0
                                     ? 'Heute'
                                     : (((int) $comet['days_from_today'] > 0 ? '+' : '') . (int) $comet['days_from_today'] . ' Tage'));
+                            $perihelionTs = $comet['perihelion_date_object'] instanceof DateTimeImmutable ? $comet['perihelion_date_object']->getTimestamp() : '';
                             ?>
                             <tr>
                                 <td>
@@ -691,11 +717,11 @@ arsort($orbitTypeCounts);
                                     </div>
                                 </td>
                                 <td><?= h((string) $comet['orbit_type_label']) ?></td>
-                                <td><?= h((string) $comet['ra_display']) ?></td>
-                                <td><?= h((string) $comet['dec_display']) ?></td>
-                                <td><?= h((string) $comet['perihelion_date_display']) ?></td>
-                                <td><span class="comets-days <?= $daysClass ?>"><?= h($daysLabel) ?></span></td>
-                                <td title="r = <?= h((string) $comet['heliocentric_distance_display']) ?> AE, Δ = <?= h((string) $comet['geocentric_distance_display']) ?> AE"><?= h((string) $comet['estimated_magnitude_display']) ?></td>
+                                <td data-sort-value="<?= h((string) ($comet['ra_hours'] ?? '')) ?>"><?= h((string) $comet['ra_display']) ?></td>
+                                <td data-sort-value="<?= h((string) ($comet['dec_deg'] ?? '')) ?>"><?= h((string) $comet['dec_display']) ?></td>
+                                <td data-sort-value="<?= h((string) $perihelionTs) ?>"><?= h((string) $comet['perihelion_date_display']) ?></td>
+                                <td data-sort-value="<?= h((string) ($comet['days_from_today'] ?? '')) ?>"><span class="comets-days <?= $daysClass ?>"><?= h($daysLabel) ?></span></td>
+                                <td data-sort-value="<?= h((string) ($comet['estimated_magnitude'] ?? '')) ?>" title="r = <?= h((string) $comet['heliocentric_distance_display']) ?> AE, Δ = <?= h((string) $comet['geocentric_distance_display']) ?> AE"><?= h((string) $comet['estimated_magnitude_display']) ?></td>
                             </tr>
                         <?php endforeach; ?>
                     </tbody>
@@ -705,4 +731,46 @@ arsort($orbitTypeCounts);
     </section>
 </div>
 
+<script>
+(function () {
+    function getCellValue(row, colIndex) {
+        const cell = row.cells[colIndex];
+        if (!cell) return '';
+        const sv = cell.getAttribute('data-sort-value');
+        if (sv !== null && sv !== '') return sv;
+        return cell.textContent.trim();
+    }
+
+    function compareValues(a, b) {
+        const numA = parseFloat(a);
+        const numB = parseFloat(b);
+        if (!isNaN(numA) && !isNaN(numB)) return numA - numB;
+        return a.localeCompare(b, 'de', { sensitivity: 'base' });
+    }
+
+    document.querySelectorAll('.comets-table').forEach(function (table) {
+        const headers = table.querySelectorAll('th[data-sortable]');
+        headers.forEach(function (th, colIndex) {
+            th.addEventListener('click', function () {
+                const currentDir = th.getAttribute('data-sort-dir');
+                const ascending = currentDir !== 'asc';
+
+                headers.forEach(function (h) { h.removeAttribute('data-sort-dir'); });
+                th.setAttribute('data-sort-dir', ascending ? 'asc' : 'desc');
+
+                const tbody = table.querySelector('tbody');
+                const rows = Array.from(tbody.querySelectorAll('tr'));
+                rows.sort(function (a, b) {
+                    const av = getCellValue(a, colIndex);
+                    const bv = getCellValue(b, colIndex);
+                    const cmp = compareValues(av, bv);
+                    return ascending ? cmp : -cmp;
+                });
+                rows.forEach(function (row) { tbody.appendChild(row); });
+            });
+        });
+    });
+}());
+</script>
+
 <?php require __DIR__ . '/footer.php'; ?>