Refresh legacy pages, align Seth rules text, and ship astronomy location controls

RELEASE_CONTEXT.md

@@ -0,0 +1,30 @@
+# Seth Clock Suite - Major Refresh Context
+
+Date: 2026-03-09
+Scope: `clock.sethpc.xyz` static app suite
+
+## Highlights
+
+- Astronomy page now shows Seth/Gregorian columns for core metrics.
+- Astronomy event list now shows dual dates (Seth + Gregorian) per item.
+- Astronomy location controls added:
+  - manual lat/lon + label
+  - US ZIP lookup
+  - browser geolocation helper
+  - session persistence (`sessionStorage`) with cookie mirror fallback
+- Navigation consistency improved across pages (`/`, `/decimal`, `/convert`, `/seth`, `/calendar`, `/astro`).
+- Seth Date reference text corrected for auxiliary day rules and Dec 25/26 mappings.
+
+## Canonical Seth rules reflected
+
+- 10 months x 36 days (0-indexed)
+- Leap day is intercalary (outside month grid)
+- Auxiliary days are always H0-H4 (5 total)
+- Dec 25 -> M9D34, Dec 26 -> M9D35 (both leap and non-leap)
+
+## Operational notes
+
+- Repo path: `/root/bin/clock-site`
+- Live deployment path: CT 242 `/opt/clock-site`
+- Service: `clock.service`
+- Domain: `clock.sethpc.xyz`

convert.html

@@ -109,7 +109,13 @@
       <img class="logo-img" src="https://storage.googleapis.com/sethfreiberg.com/sethflix/favicon.png" alt="SethPC logo">
       <span class="brand-text">Time Converter</span>
     </div>
-    <p class="kicker">Decimal &harr; Gregorian &nbsp;·&nbsp; <a href="/seth" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Seth Date &rarr;</a></p>
+    <p class="kicker">
+      Decimal &harr; Gregorian &nbsp;·&nbsp;
+      <a href="/seth" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Seth Date</a> &nbsp;·&nbsp;
+      <a href="/calendar" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Calendar</a> &nbsp;·&nbsp;
+      <a href="/decimal" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Decimal</a> &nbsp;·&nbsp;
+      <a href="/astro" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Astronomy</a>
+    </p>
 
     <button class="now-btn" id="nowBtn">Use current time</button>
 

decimal.html

@@ -53,7 +53,13 @@
       <img class="logo-img" src="https://storage.googleapis.com/sethfreiberg.com/sethflix/favicon.png" alt="SethPC logo">
       <span class="brand-text">SethPC Decimal Time</span>
     </div>
-    <p class="kicker">French Republican / Decimal Time &amp; Date</p>
+    <p class="kicker">
+      French Republican / Decimal Time &amp; Date &nbsp;·&nbsp;
+      <a href="/seth" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Seth Date</a> &nbsp;·&nbsp;
+      <a href="/calendar" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Calendar</a> &nbsp;·&nbsp;
+      <a href="/convert" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Converter</a> &nbsp;·&nbsp;
+      <a href="/astro" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Astronomy</a>
+    </p>
     <h1 id="dateLine">Loading date...</h1>
     <p id="dateTrans" class="decimal-note" style="margin:0 0 0.6rem; font-size:0.9rem;"></p>
     <p id="digital" class="digital">-:--.--</p>

index.html

@@ -13,7 +13,13 @@
       <img class="logo-img" src="https://storage.googleapis.com/sethfreiberg.com/sethflix/favicon.png" alt="Sethflix logo">
       <span class="brand-text">SethPC Time</span>
     </div>
-    <p class="kicker">Official U.S. Time</p>
+    <p class="kicker">
+      Official U.S. Time &nbsp;·&nbsp;
+      <a href="/seth" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Seth Date</a> &nbsp;·&nbsp;
+      <a href="/calendar" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Calendar</a> &nbsp;·&nbsp;
+      <a href="/convert" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Converter</a> &nbsp;·&nbsp;
+      <a href="/astro" style="color:var(--accent);text-decoration:none;font-size:0.85rem;">Astronomy</a>
+    </p>
     <h1 id="dateLine">Loading date...</h1>
     <p id="digital" class="digital">--:--:--.--</p>
 

seth.html

@@ -135,7 +135,7 @@
       <p>
         <strong>Seth Date</strong> uses the same year numbers and January 1 new year as the Gregorian
         calendar. The year is divided into <strong>10 months of 36 days each</strong>,
-        followed by <strong>5 holiday days</strong> at year end (6 on leap years).
+        followed by <strong>5 auxiliary (intercalary) days</strong> at year end (H0-H4, always 5).
         All units are <strong>zero-indexed</strong>: months 0&ndash;9, days-of-month 0&ndash;35.
         Time uses the same decimal system: 10 hours, 100 minutes, 100 seconds per day.
         The Seth second is derived from the Unix second (which equals the SI second, leap seconds aside)
@@ -159,7 +159,7 @@
           <tr><td>Full / reverse</td><td>YYYY.M.DD</td><td>2026.3.16</td></tr>
         </tbody>
       </table>
-      <p>Holiday days are written as <em>H0</em>&ndash;<em>H4</em> (or <em>H5</em> on leap years).</p>
+      <p>Auxiliary days are written as <em>H0</em>&ndash;<em>H4</em> (always 5 total).</p>
       <p><strong>Months</strong> (months 0&ndash;9, days 0&ndash;35, approx. Gregorian ranges):</p>
       <table class="ref-table">
         <thead><tr><th>#</th><th>Days</th><th>Approx. Gregorian</th><th>Notes</th></tr></thead>
@@ -176,7 +176,7 @@
           <tr><td>9</td><td>0&ndash;35</td><td>Nov 21 &ndash; Dec 26</td><td>Ends Dec 25 on leap years</td></tr>
         </tbody>
       </table>
-      <p><strong>Holiday days</strong> (after Month 9, Day 35 — always exactly 5):</p>
+      <p><strong>Auxiliary days</strong> (after Month 9, Day 35 — always exactly 5):</p>
       <table class="ref-table">
         <thead><tr><th>Holiday</th><th>Normal year</th><th>Leap year</th></tr></thead>
         <tbody>
@@ -189,8 +189,8 @@
       </table>
       <p style="font-size:0.8rem;">
         Leap Day (Feb 29) is the intercalary day, not an extra holiday.<br>
-        Christmas (Dec 25) falls on Month 9, Day 34 in normal years, and Month 9, Day 35 in leap years.<br>
+        Christmas (Dec 25) falls on Month 9, Day 34 in both normal and leap years.<br>
-        Dec 26 (Boxing Day) is Month 9, Day 35 in normal years, and Month 9, Day 35 in leap years (same slot, one day earlier Gregorian).
+        Dec 26 (Boxing Day) falls on Month 9, Day 35 in both normal and leap years.
       </p>
       </div>
     </details>