Small tweaks

assets/js/events/weather-checks.js

@@ -12,20 +12,48 @@
 // ------------------------------------------------------------------------
 
 export function checkStargazing(rows) {
-  // Great stargazing: mostly clear night hours with low cloud
+  // Great stargazing: mostly clear night hours with low cloud.
+  // Split night into contiguous runs (pre-dawn vs post-dusk) and evaluate
+  // each independently so a cloudy evening doesn't suppress a clear morning
+  // (or vice versa), and so the icon is pinned to only the clear hours.
   const nightRows = rows.filter(r => r.elev < -5);
   if (nightRows.length < 3) return null;
-  const avgCloud = nightRows.reduce((s, r) => s + r.cc, 0) / nightRows.length;
-  if (avgCloud > 30) return null;
+
+  // Build contiguous runs — a gap > 2 h means we've crossed daytime.
+  const runs = [];
+  let cur = [nightRows[0]];
+  for (let i = 1; i < nightRows.length; i++) {
+    const dtDiff = (new Date(nightRows[i].iso) - new Date(nightRows[i - 1].iso)) / 3600000;
+    if (dtDiff <= 2) { cur.push(nightRows[i]); }
+    else             { runs.push(cur); cur = [nightRows[i]]; }
+  }
+  runs.push(cur);
+
+  // Evaluate each run; among those passing ≤30% avg cloud prefer the evening
+  // run (actionable for tonight) then fall back to whichever is clearest.
+  let bestRun = null, bestAvg = Infinity;
+  for (const run of runs) {
+    if (run.length < 2) continue;
+    const avg = run.reduce((s, r) => s + r.cc, 0) / run.length;
+    if (avg > 30) continue;
+    const isEvening = parseInt(run[0].iso.slice(11, 13), 10) >= 12;
+    if (!bestRun || (isEvening && parseInt(bestRun[0].iso.slice(11, 13), 10) < 12) || avg < bestAvg) {
+      bestRun = run; bestAvg = avg;
+    }
+  }
+  if (!bestRun) return null;
+
+  const isPreDawn = parseInt(bestRun[0].iso.slice(11, 13), 10) < 12;
   return {
     id: 'stargazing',
     emoji: '⭐',
-    title: 'Great Stargazing Tonight',
-    message: `Clear skies expected overnight at ${nightRows.length} hours with average ${Math.round(avgCloud)}% cloud — ideal conditions for stargazing.`,
+    title: isPreDawn ? 'Great Stargazing Overnight' : 'Great Stargazing Tonight',
+    message: `Clear skies expected for ${bestRun.length} hours overnight with average ${Math.round(bestAvg)}% cloud — ideal conditions for stargazing.`,
     color: '#080e1a',
     textColor: '#c8dcff',
     type: 'weather',
     nightOnly: true,
+    isoRange: [bestRun[0].iso, bestRun[bestRun.length - 1].iso],
   };
 }