feat(sun-position): redesign arc to touch horizon at endpoints

- Arc geometry now uses chord-radius calculation for proper horizon intersection
- Sunrise/sunset icons integrated at horizon endpoints (removed duplicate labels)
- Daylight duration centered below arc
- Increased all environment card heights 20% (140px → 170px) for better arc visibility
- Visual balance: sunrise/sunset raised 10px, daylight at bottom

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,32 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.5.3] - 2026-01-07
+
+### Changed
+
+- **Sun position arc redesign** - Arc now touches horizon at sunrise/sunset points
+  - Arc geometry uses chord-radius calculation for proper horizon intersection
+  - Sunrise/sunset icons integrated at horizon endpoints (no duplicate labels)
+  - Daylight duration centered below arc
+  - Increased card height 20% for better arc visibility (140px → 170px)
+- **Visual balance improvements** - Sunrise/sunset labels raised 10px, daylight label at bottom
+
+## [1.5.2] - 2026-01-07
+
+### Changed
+
+- **Proportional sun/moon arc visualization** - Arc angle now proportional to day/night duration
+  - Day arc: spans (daylight hours / 24) × 360° above horizon
+  - Night arc: spans (night hours / 24) × 360° with moon traversal
+  - Horizon points represent sunrise/sunset times
+  - Gradient colors: yellow/orange for day, blue/indigo for night
+- **Sun position widget now updates every 10 minutes** - Position aligned to clock intervals (0/10/20/30/40/50)
+  - Converted to StatefulWidget with timer-based updates
+  - Shows default 7am/5pm sunrise/sunset when API data unavailable (asymmetric for visual effect)
+  - Always displays times and daylight duration (no more "--:--")
+- **Environment widgets consistent height** - All cards maintain same height in "no data" state
+
 ## [1.5.1] - 2026-01-07
 
 ### Changed

lib/shared/widgets/air_quality_widget.dart

@@ -210,26 +210,30 @@ class AirQualityWidget extends StatelessWidget {
                 ),
               ],
             ),
-            const SizedBox(height: 24),
-            Center(
-              child: Column(
-                children: [
-                  Icon(
-                    Icons.air_outlined,
-                    size: 32,
-                    color: colorScheme.outline,
-                  ),
-                  const SizedBox(height: 8),
-                  Text(
-                    'No data available',
-                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                          color: colorScheme.outline,
-                        ),
-                  ),
-                ],
+            const SizedBox(height: 8),
+            // Match sun position card height (170px content area)
+            SizedBox(
+              height: 170,
+              child: Center(
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  children: [
+                    Icon(
+                      Icons.air_outlined,
+                      size: 32,
+                      color: colorScheme.outline,
+                    ),
+                    const SizedBox(height: 8),
+                    Text(
+                      'No data available',
+                      style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                            color: colorScheme.outline,
+                          ),
+                    ),
+                  ],
+                ),
               ),
             ),
-            const SizedBox(height: 16),
           ],
         ),
       ),

lib/shared/widgets/forecast_widget.dart

@@ -27,13 +27,52 @@ class ForecastWidget extends StatelessWidget {
       return Card(
         child: Padding(
           padding: const EdgeInsets.all(16),
-          child: Center(
-            child: Text(
-              'No forecast data available',
-              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              // Header
+              Row(
+                children: [
+                  Icon(
+                    Icons.calendar_today,
+                    size: 20,
                     color: colorScheme.onSurfaceVariant,
                   ),
-            ),
+                  const SizedBox(width: 8),
+                  Text(
+                    'Forecast',
+                    style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 8),
+              // Match sun position card height (170px content area)
+              SizedBox(
+                height: 170,
+                child: Center(
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    children: [
+                      Icon(
+                        Icons.event_busy_outlined,
+                        size: 32,
+                        color: colorScheme.outline,
+                      ),
+                      const SizedBox(height: 8),
+                      Text(
+                        'No data available',
+                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                              color: colorScheme.outline,
+                            ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ],
           ),
         ),
       );

lib/shared/widgets/sun_position_widget.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:math' as math;
 import 'package:flutter/material.dart';
 import 'package:tatlock_ui/features/front_hall/data/models/environment_model.dart';
@@ -9,7 +10,11 @@ import 'package:tatlock_ui/features/front_hall/data/models/environment_model.dar
 /// - Blue tones for night
 /// - Orange tones for sunrise/sunset
 /// - Yellow tones for daytime
-class SunPositionWidget extends StatelessWidget {
+///
+/// Position updates every 10 minutes based on system clock.
+/// When sun times are unavailable, assumes 12-hour day/night cycles
+/// (6am sunrise, 6pm sunset).
+class SunPositionWidget extends StatefulWidget {
   const SunPositionWidget({
     super.key,
     this.sunTimes,
@@ -22,11 +27,71 @@ class SunPositionWidget extends StatelessWidget {
   /// Whether to use compact layout.
   final bool compact;
 
+  @override
+  State<SunPositionWidget> createState() => _SunPositionWidgetState();
+}
+
+class _SunPositionWidgetState extends State<SunPositionWidget> {
+  Timer? _positionTimer;
+
+  @override
+  void initState() {
+    super.initState();
+    _scheduleNextUpdate();
+  }
+
+  /// Schedule update at next 10-minute wall clock mark (0/10/20/30/40/50)
+  void _scheduleNextUpdate() {
+    final now = DateTime.now();
+    final currentMinute = now.minute;
+    // Calculate minutes until next 10-minute mark
+    final minutesUntilNext = 10 - (currentMinute % 10);
+    final secondsUntilNext = (minutesUntilNext * 60) - now.second;
+
+    _positionTimer = Timer(
+      Duration(seconds: secondsUntilNext),
+      () {
+        if (mounted) {
+          setState(() {});
+          _scheduleNextUpdate();
+        }
+      },
+    );
+  }
+
+  @override
+  void dispose() {
+    _positionTimer?.cancel();
+    super.dispose();
+  }
+
+  /// Get sunrise time, defaulting to 7am if not available (asymmetric for visual effect)
+  DateTime get _sunrise {
+    final now = DateTime.now();
+    return widget.sunTimes?.sunrise ?? DateTime(now.year, now.month, now.day, 7, 0);
+  }
+
+  /// Get sunset time, defaulting to 5pm if not available (asymmetric for visual effect)
+  DateTime get _sunset {
+    final now = DateTime.now();
+    return widget.sunTimes?.sunset ?? DateTime(now.year, now.month, now.day, 17, 0);
+  }
+
+  /// Calculate daylight minutes from sunrise/sunset
+  int get _daylightMinutes {
+    return _sunset.difference(_sunrise).inMinutes;
+  }
+
+  bool get _isDaytime {
+    final now = DateTime.now();
+    return now.isAfter(_sunrise) && now.isBefore(_sunset);
+  }
+
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
 
-    if (compact) {
+    if (widget.compact) {
       return _buildCompact(context, colorScheme);
     }
 
@@ -54,42 +119,63 @@ class SunPositionWidget extends StatelessWidget {
                 ),
               ],
             ),
-            const SizedBox(height: 16),
+            const SizedBox(height: 8),
 
-            // Arc visualization
+            // Arc with integrated horizon labels
             SizedBox(
-              height: 120,
-              child: CustomPaint(
-                size: const Size(double.infinity, 120),
-                painter: _SunArcPainter(
-                  sunTimes: sunTimes,
-                  isDark: colorScheme.brightness == Brightness.dark,
-                ),
+              height: 170,
+              child: LayoutBuilder(
+                builder: (context, constraints) {
+                  return Stack(
+                    clipBehavior: Clip.none,
+                    children: [
+                      // Arc painter
+                      Positioned.fill(
+                        child: CustomPaint(
+                          painter: _SunArcPainter(
+                            sunTimes: widget.sunTimes,
+                            isDark: colorScheme.brightness == Brightness.dark,
+                          ),
+                        ),
+                      ),
+                      // Sunrise widget at left horizon (10px up for balance)
+                      Positioned(
+                        left: 0,
+                        bottom: 10,
+                        child: _HorizonTimeDisplay(
+                          icon: Icons.wb_twilight,
+                          label: 'Sunrise',
+                          time: _sunrise,
+                          iconColor: Colors.orange,
+                          alignment: CrossAxisAlignment.start,
+                        ),
+                      ),
+                      // Daylight display centered (at bottom for balance)
+                      Positioned(
+                        left: 0,
+                        right: 0,
+                        bottom: 0,
+                        child: Center(
+                          child: _DaylightDisplay(minutes: _daylightMinutes),
+                        ),
+                      ),
+                      // Sunset widget at right horizon (10px up for balance)
+                      Positioned(
+                        right: 0,
+                        bottom: 10,
+                        child: _HorizonTimeDisplay(
+                          icon: Icons.nights_stay,
+                          label: 'Sunset',
+                          time: _sunset,
+                          iconColor: Colors.deepOrange,
+                          alignment: CrossAxisAlignment.end,
+                        ),
+                      ),
+                    ],
+                  );
+                },
               ),
             ),
-
-            const SizedBox(height: 12),
-
-            // Sunrise/Sunset times
-            Row(
-              mainAxisAlignment: MainAxisAlignment.spaceBetween,
-              children: [
-                _TimeDisplay(
-                  icon: Icons.wb_twilight,
-                  label: 'Sunrise',
-                  time: sunTimes?.sunrise,
-                  iconColor: Colors.orange,
-                ),
-                if (sunTimes?.daylightMinutes != null)
-                  _DaylightDisplay(minutes: sunTimes!.daylightMinutes!),
-                _TimeDisplay(
-                  icon: Icons.nights_stay,
-                  label: 'Sunset',
-                  time: sunTimes?.sunset,
-                  iconColor: Colors.deepOrange,
-                ),
-              ],
-            ),
           ],
         ),
       ),
@@ -114,11 +200,11 @@ class SunPositionWidget extends StatelessWidget {
               mainAxisSize: MainAxisSize.min,
               children: [
                 Text(
-                  _formatTime(sunTimes?.sunrise),
+                  _formatTime(_sunrise),
                   style: Theme.of(context).textTheme.labelSmall,
                 ),
                 Text(
-                  _formatTime(sunTimes?.sunset),
+                  _formatTime(_sunset),
                   style: Theme.of(context).textTheme.labelSmall,
                 ),
               ],
@@ -129,50 +215,44 @@ class SunPositionWidget extends StatelessWidget {
     );
   }
 
-  bool get _isDaytime {
-    final now = DateTime.now();
-    // Use actual sun times if available, otherwise default to 6am/6pm
-    final sunrise = sunTimes?.sunrise ??
-        DateTime(now.year, now.month, now.day, 6, 0);
-    final sunset = sunTimes?.sunset ??
-        DateTime(now.year, now.month, now.day, 18, 0);
-    return now.isAfter(sunrise) && now.isBefore(sunset);
-  }
-
-  String _formatTime(DateTime? time) {
-    if (time == null) return '--:--';
+  String _formatTime(DateTime time) {
     return '${time.hour.toString().padLeft(2, '0')}:${time.minute.toString().padLeft(2, '0')}';
   }
 }
 
-class _TimeDisplay extends StatelessWidget {
-  const _TimeDisplay({
+/// Horizon-aligned time display with icon above time and label.
+class _HorizonTimeDisplay extends StatelessWidget {
+  const _HorizonTimeDisplay({
     required this.icon,
     required this.label,
     required this.time,
     this.iconColor,
+    this.alignment = CrossAxisAlignment.center,
   });
 
   final IconData icon;
   final String label;
-  final DateTime? time;
+  final DateTime time;
   final Color? iconColor;
+  final CrossAxisAlignment alignment;
 
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
 
     return Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: alignment,
       children: [
         Icon(
           icon,
-          size: 20,
+          size: 18,
           color: iconColor ?? colorScheme.primary,
         ),
-        const SizedBox(height: 4),
+        const SizedBox(height: 2),
         Text(
-          _formatTime(time),
-          style: Theme.of(context).textTheme.titleSmall?.copyWith(
+          '${time.hour.toString().padLeft(2, '0')}:${time.minute.toString().padLeft(2, '0')}',
+          style: Theme.of(context).textTheme.labelMedium?.copyWith(
                 fontWeight: FontWeight.w600,
               ),
         ),
@@ -180,16 +260,12 @@ class _TimeDisplay extends StatelessWidget {
           label,
           style: Theme.of(context).textTheme.labelSmall?.copyWith(
                 color: colorScheme.onSurfaceVariant,
+                fontSize: 10,
               ),
         ),
       ],
     );
   }
-
-  String _formatTime(DateTime? time) {
-    if (time == null) return '--:--';
-    return '${time.hour.toString().padLeft(2, '0')}:${time.minute.toString().padLeft(2, '0')}';
-  }
 }
 
 class _DaylightDisplay extends StatelessWidget {
@@ -228,6 +304,11 @@ class _DaylightDisplay extends StatelessWidget {
 }
 
 /// Custom painter for the sun arc visualization.
+///
+/// The arc is proportional to the day/night duration:
+/// - During day: shows a day arc spanning (daylight hours / 24) × 360°
+/// - During night: shows a night arc spanning (night hours / 24) × 360°
+/// - Arc endpoints touch the horizon line at sunrise/sunset positions
 class _SunArcPainter extends CustomPainter {
   _SunArcPainter({
     this.sunTimes,
@@ -245,199 +326,257 @@ class _SunArcPainter extends CustomPainter {
   static const _dayGold = Color(0xFFffb300);
   static const _duskOrange = Color(0xFFef6c00);
   static const _nightIndigo = Color(0xFF283593);
+  static const _moonSilver = Color(0xFFB0BEC5);
 
   @override
   void paint(Canvas canvas, Size size) {
-    final center = Offset(size.width / 2, size.height - 10);
-    final radius = math.min(size.width / 2 - 20, size.height - 30);
+    final now = DateTime.now();
+
+    // Get sunrise/sunset times (default to 7am/5pm for asymmetric visual)
+    final sunrise = sunTimes?.sunrise ?? DateTime(now.year, now.month, now.day, 7, 0);
+    final sunset = sunTimes?.sunset ?? DateTime(now.year, now.month, now.day, 17, 0);
+
+    // Calculate durations
+    final daylightMinutes = sunset.difference(sunrise).inMinutes;
+    final nightMinutes = 1440 - daylightMinutes; // 24 hours = 1440 minutes
+
+    // Determine if currently day or night
+    final isDaytime = now.isAfter(sunrise) && now.isBefore(sunset);
+
+    // Calculate arc angles (proportional to duration)
+    final dayArcAngle = (daylightMinutes / 1440) * 2 * math.pi;
+    final nightArcAngle = (nightMinutes / 1440) * 2 * math.pi;
+
+    // Layout constants - horizon is 50px from bottom to leave room for labels
+    const horizonY = 50.0;
+    const horizontalPadding = 40.0;
+    final horizonWidth = size.width - (horizontalPadding * 2);
+    final centerX = size.width / 2;
 
     // Draw horizon line
     final horizonPaint = Paint()
       ..color = isDark ? Colors.white24 : Colors.black12
       ..strokeWidth = 1;
     canvas.drawLine(
-      Offset(center.dx - radius - 10, center.dy),
-      Offset(center.dx + radius + 10, center.dy),
+      Offset(horizontalPadding - 5, size.height - horizonY),
+      Offset(size.width - horizontalPadding + 5, size.height - horizonY),
       horizonPaint,
     );
 
-    // Create gradient for arc background
+    if (isDaytime) {
+      _drawDayArc(canvas, size, centerX, horizonWidth, horizonY, dayArcAngle, now, sunrise, sunset);
+    } else {
+      _drawNightArc(canvas, size, centerX, horizonWidth, horizonY, nightArcAngle, now, sunrise, sunset);
+    }
+  }
+
+  void _drawDayArc(
+    Canvas canvas,
+    Size size,
+    double centerX,
+    double horizonWidth,
+    double horizonY,
+    double arcAngle,
+    DateTime now,
+    DateTime sunrise,
+    DateTime sunset,
+  ) {
+    // Clamp arc angle between 30° and 180° for visual sanity
+    final clampedAngle = arcAngle.clamp(math.pi / 6, math.pi);
+
+    // Calculate radius so arc endpoints touch horizon
+    // For a chord of width W and arc angle θ: R = W / (2 * sin(θ/2))
+    final radius = horizonWidth / (2 * math.sin(clampedAngle / 2));
+
+    // Arc center is below the horizon for an upward-bulging arc
+    // Distance from chord to center = R * cos(θ/2)
+    final horizonYPos = size.height - horizonY;
+    final centerY = horizonYPos + radius * math.cos(clampedAngle / 2);
+    final center = Offset(centerX, centerY);
+
+    // The arc starts at the LEFT horizon point
+    // In canvas coords (Y down), angle to left point = 3π/2 - θ/2
+    // The arc sweeps clockwise (positive) through angle θ to reach right point
+    final startAngle = (3 * math.pi / 2) - (clampedAngle / 2);
+
     final arcRect = Rect.fromCenter(
       center: center,
       width: radius * 2,
       height: radius * 2,
     );
 
-    // Draw arc background (night portion below horizon implied)
-    final arcBgPaint = Paint()
+    // Draw arc background with day gradient
+    final arcPaint = Paint()
       ..style = PaintingStyle.stroke
-      ..strokeWidth = 8
-      ..strokeCap = StrokeCap.round;
+      ..strokeWidth = 6
+      ..strokeCap = StrokeCap.round
+      ..shader = SweepGradient(
+        center: Alignment.center,
+        startAngle: 0,
+        endAngle: 2 * math.pi,
+        colors: [
+          _dawnOrange.withValues(alpha: 0.6),
+          _sunriseOrange.withValues(alpha: 0.7),
+          _dayYellow.withValues(alpha: 0.8),
+          _dayGold.withValues(alpha: 0.8),
+          _dayYellow.withValues(alpha: 0.7),
+          _duskOrange.withValues(alpha: 0.6),
+        ],
+        stops: const [0.0, 0.15, 0.4, 0.6, 0.85, 1.0],
+        transform: GradientRotation(startAngle),
+      ).createShader(arcRect);
 
-    // Create gradient that transitions through time of day colors
-    arcBgPaint.shader = SweepGradient(
-      center: Alignment.bottomCenter,
-      startAngle: math.pi,
-      endAngle: 2 * math.pi,
-      colors: [
-        _nightBlue.withValues(alpha: 0.3),
-        _dawnOrange.withValues(alpha: 0.5),
-        _sunriseOrange.withValues(alpha: 0.6),
-        _dayYellow.withValues(alpha: 0.7),
-        _dayGold.withValues(alpha: 0.7),
-        _dayYellow.withValues(alpha: 0.6),
-        _duskOrange.withValues(alpha: 0.5),
-        _nightIndigo.withValues(alpha: 0.3),
-      ],
-      stops: const [0.0, 0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0],
-      transform: const GradientRotation(-math.pi / 2),
-    ).createShader(arcRect);
+    // Draw the arc (positive sweep = clockwise in canvas coords = visually upward arc)
+    canvas.drawArc(arcRect, startAngle, clampedAngle, false, arcPaint);
 
-    // Draw the arc (semicircle from left to right)
-    canvas.drawArc(
-      arcRect,
-      math.pi, // Start at left (180 degrees)
-      math.pi, // Sweep 180 degrees (semicircle)
-      false,
-      arcBgPaint,
-    );
-
-    // Calculate sun position
-    final sunPosition = _calculateSunPosition();
-
-    // Draw sun/moon indicator
-    final angle = math.pi + (sunPosition * math.pi); // Map 0-1 to pi-2pi
-    final sunX = center.dx + radius * math.cos(angle);
-    final sunY = center.dy + radius * math.sin(angle);
-
-    // Determine if day or night for icon/color
-    final isDaytime = sunPosition > 0 && sunPosition < 1;
-    final isNearHorizon = sunPosition < 0.15 || sunPosition > 0.85;
-
-    // Sun/moon glow
-    if (isDaytime) {
-      final glowColor = isNearHorizon ? _dawnOrange : _dayYellow;
-      final glowPaint = Paint()
-        ..shader = RadialGradient(
-          colors: [
-            glowColor.withValues(alpha: 0.6),
-            glowColor.withValues(alpha: 0.0),
-          ],
-        ).createShader(
-          Rect.fromCircle(center: Offset(sunX, sunY), radius: 24),
-        );
-      canvas.drawCircle(Offset(sunX, sunY), 24, glowPaint);
-    }
-
-    // Sun/moon circle
-    final sunPaint = Paint()
-      ..style = PaintingStyle.fill
-      ..color = isDaytime
-          ? (isNearHorizon ? _sunriseOrange : _dayYellow)
-          : _nightIndigo;
-
-    canvas.drawCircle(Offset(sunX, sunY), 12, sunPaint);
-
-    // Sun rays or moon craters
-    if (isDaytime) {
-      final rayPaint = Paint()
-        ..style = PaintingStyle.stroke
-        ..strokeWidth = 2
-        ..color = (isNearHorizon ? _dawnOrange : _dayGold).withValues(alpha: 0.8);
-
-      for (var i = 0; i < 8; i++) {
-        final rayAngle = (i * math.pi / 4);
-        final innerRadius = 14.0;
-        final outerRadius = 18.0;
-        canvas.drawLine(
-          Offset(
-            sunX + innerRadius * math.cos(rayAngle),
-            sunY + innerRadius * math.sin(rayAngle),
-          ),
-          Offset(
-            sunX + outerRadius * math.cos(rayAngle),
-            sunY + outerRadius * math.sin(rayAngle),
-          ),
-          rayPaint,
-        );
-      }
-    } else {
-      // Moon highlight
-      final moonHighlight = Paint()
-        ..style = PaintingStyle.fill
-        ..color = Colors.white24;
-      canvas.drawCircle(Offset(sunX - 3, sunY - 3), 4, moonHighlight);
-    }
-
-    // Draw time markers on arc
-    _drawTimeMarkers(canvas, center, radius);
-  }
-
-  double _calculateSunPosition() {
-    final now = DateTime.now();
-
-    // Use actual sun times if available, otherwise default to 6am/6pm (12-hour cycles)
-    final sunrise = sunTimes?.sunrise ??
-        DateTime(now.year, now.month, now.day, 6, 0);
-    final sunset = sunTimes?.sunset ??
-        DateTime(now.year, now.month, now.day, 18, 0);
-
-    // Before sunrise
-    if (now.isBefore(sunrise)) {
-      // Calculate position in pre-dawn (negative values = below horizon)
-      final midnight = DateTime(now.year, now.month, now.day);
-      final minutesSinceMidnight = now.difference(midnight).inMinutes;
-      final minutesToSunrise = sunrise.difference(midnight).inMinutes;
-      // Map to 0 at sunrise, negative before
-      return (minutesSinceMidnight / minutesToSunrise) * 0.15 - 0.1;
-    }
-
-    // After sunset
-    if (now.isAfter(sunset)) {
-      // Calculate position in post-dusk
-      final minutesSinceSunset = now.difference(sunset).inMinutes;
-      final nextMidnight = DateTime(now.year, now.month, now.day + 1);
-      final minutesToMidnight = nextMidnight.difference(sunset).inMinutes;
-      // Map to 1 at sunset, going towards negative
-      return 1.0 + (minutesSinceSunset / minutesToMidnight) * 0.1;
-    }
-
-    // During daylight hours
+    // Calculate sun position along the arc
     final totalDaylight = sunset.difference(sunrise).inMinutes;
     final minutesSinceSunrise = now.difference(sunrise).inMinutes;
-    return minutesSinceSunrise / totalDaylight;
-  }
+    final progress = (minutesSinceSunrise / totalDaylight).clamp(0.0, 1.0);
 
-  void _drawTimeMarkers(Canvas canvas, Offset center, double radius) {
-    final textPainter = TextPainter(
-      textDirection: TextDirection.ltr,
-      textAlign: TextAlign.center,
-    );
+    // Map progress to angle along the arc (0 = sunrise/left, 1 = sunset/right)
+    final sunAngle = startAngle + (progress * clampedAngle);
+    final sunX = center.dx + radius * math.cos(sunAngle);
+    final sunY = center.dy + radius * math.sin(sunAngle);
 
-    final markerStyle = TextStyle(
-      fontSize: 10,
-      color: isDark ? Colors.white38 : Colors.black38,
-    );
+    // Determine sun color based on position (orange near horizon, yellow at peak)
+    final isNearHorizon = progress < 0.15 || progress > 0.85;
+    final sunColor = isNearHorizon ? _sunriseOrange : _dayYellow;
+    final glowColor = isNearHorizon ? _dawnOrange : _dayYellow;
 
-    // Draw quarter markers (6am, 12pm, 6pm positions conceptually)
-    final markers = ['6:00', '12:00', '18:00'];
-    final positions = [0.25, 0.5, 0.75];
+    // Draw sun glow
+    final glowPaint = Paint()
+      ..shader = RadialGradient(
+        colors: [
+          glowColor.withValues(alpha: 0.6),
+          glowColor.withValues(alpha: 0.0),
+        ],
+      ).createShader(Rect.fromCircle(center: Offset(sunX, sunY), radius: 20));
+    canvas.drawCircle(Offset(sunX, sunY), 20, glowPaint);
 
-    for (var i = 0; i < markers.length; i++) {
-      final angle = math.pi + (positions[i] * math.pi);
-      final markerRadius = radius + 15;
-      final x = center.dx + markerRadius * math.cos(angle);
-      final y = center.dy + markerRadius * math.sin(angle);
+    // Draw sun
+    final sunPaint = Paint()
+      ..style = PaintingStyle.fill
+      ..color = sunColor;
+    canvas.drawCircle(Offset(sunX, sunY), 10, sunPaint);
 
-      textPainter.text = TextSpan(text: markers[i], style: markerStyle);
-      textPainter.layout();
-      textPainter.paint(
-        canvas,
-        Offset(x - textPainter.width / 2, y - textPainter.height / 2),
+    // Draw sun rays
+    final rayPaint = Paint()
+      ..style = PaintingStyle.stroke
+      ..strokeWidth = 2
+      ..color = (isNearHorizon ? _dawnOrange : _dayGold).withValues(alpha: 0.8);
+
+    for (var i = 0; i < 8; i++) {
+      final rayAngle = (i * math.pi / 4);
+      canvas.drawLine(
+        Offset(sunX + 12 * math.cos(rayAngle), sunY + 12 * math.sin(rayAngle)),
+        Offset(sunX + 16 * math.cos(rayAngle), sunY + 16 * math.sin(rayAngle)),
+        rayPaint,
       );
     }
   }
 
+  void _drawNightArc(
+    Canvas canvas,
+    Size size,
+    double centerX,
+    double horizonWidth,
+    double horizonY,
+    double arcAngle,
+    DateTime now,
+    DateTime sunrise,
+    DateTime sunset,
+  ) {
+    // Clamp arc angle between 30° and 180° for visual sanity
+    final clampedAngle = arcAngle.clamp(math.pi / 6, math.pi);
+
+    // Calculate radius so arc endpoints touch horizon
+    final radius = horizonWidth / (2 * math.sin(clampedAngle / 2));
+
+    // Arc center is below the horizon for an upward-bulging arc
+    final horizonYPos = size.height - horizonY;
+    final centerY = horizonYPos + radius * math.cos(clampedAngle / 2);
+    final center = Offset(centerX, centerY);
+
+    // The arc starts at the LEFT horizon point
+    // In canvas coords (Y down), angle to left point = 3π/2 - θ/2
+    final startAngle = (3 * math.pi / 2) - (clampedAngle / 2);
+
+    final arcRect = Rect.fromCenter(
+      center: center,
+      width: radius * 2,
+      height: radius * 2,
+    );
+
+    // Draw arc background with night gradient
+    final arcPaint = Paint()
+      ..style = PaintingStyle.stroke
+      ..strokeWidth = 6
+      ..strokeCap = StrokeCap.round
+      ..shader = SweepGradient(
+        center: Alignment.center,
+        startAngle: 0,
+        endAngle: 2 * math.pi,
+        colors: [
+          _duskOrange.withValues(alpha: 0.4),
+          _nightIndigo.withValues(alpha: 0.5),
+          _nightBlue.withValues(alpha: 0.6),
+          _nightBlue.withValues(alpha: 0.6),
+          _nightIndigo.withValues(alpha: 0.5),
+          _dawnOrange.withValues(alpha: 0.4),
+        ],
+        stops: const [0.0, 0.15, 0.4, 0.6, 0.85, 1.0],
+        transform: GradientRotation(startAngle),
+      ).createShader(arcRect);
+
+    // Draw the arc (positive sweep = clockwise in canvas coords)
+    canvas.drawArc(arcRect, startAngle, clampedAngle, false, arcPaint);
+
+    // Calculate moon position
+    // Night spans from sunset to next sunrise
+    final double progress;
+    if (now.isAfter(sunset)) {
+      // After sunset: progress from sunset toward midnight and beyond
+      final nextSunrise = DateTime(now.year, now.month, now.day + 1, sunrise.hour, sunrise.minute);
+      final nightDuration = nextSunrise.difference(sunset).inMinutes;
+      final minutesSinceSunset = now.difference(sunset).inMinutes;
+      progress = (minutesSinceSunset / nightDuration).clamp(0.0, 1.0);
+    } else {
+      // Before sunrise: progress toward sunrise
+      final prevSunset = DateTime(now.year, now.month, now.day - 1, sunset.hour, sunset.minute);
+      final nightDuration = sunrise.difference(prevSunset).inMinutes;
+      final minutesSincePrevSunset = now.difference(prevSunset).inMinutes;
+      progress = (minutesSincePrevSunset / nightDuration).clamp(0.0, 1.0);
+    }
+
+    // Map progress to angle along the arc (0 = sunset/left, 1 = sunrise/right)
+    final moonAngle = startAngle + (progress * clampedAngle);
+    final moonX = center.dx + radius * math.cos(moonAngle);
+    final moonY = center.dy + radius * math.sin(moonAngle);
+
+    // Draw moon glow
+    final glowPaint = Paint()
+      ..shader = RadialGradient(
+        colors: [
+          _moonSilver.withValues(alpha: 0.3),
+          _moonSilver.withValues(alpha: 0.0),
+        ],
+      ).createShader(Rect.fromCircle(center: Offset(moonX, moonY), radius: 16));
+    canvas.drawCircle(Offset(moonX, moonY), 16, glowPaint);
+
+    // Draw moon
+    final moonPaint = Paint()
+      ..style = PaintingStyle.fill
+      ..color = _moonSilver;
+    canvas.drawCircle(Offset(moonX, moonY), 8, moonPaint);
+
+    // Draw crescent shadow for moon effect
+    final shadowPaint = Paint()
+      ..style = PaintingStyle.fill
+      ..color = _nightBlue.withValues(alpha: 0.7);
+    canvas.drawCircle(Offset(moonX + 3, moonY - 1), 6, shadowPaint);
+  }
+
   @override
   bool shouldRepaint(covariant _SunArcPainter oldDelegate) {
     return oldDelegate.sunTimes != sunTimes || oldDelegate.isDark != isDark;

lib/shared/widgets/weather_widget.dart

@@ -212,26 +212,30 @@ class WeatherWidget extends StatelessWidget {
                 ),
               ],
             ),
-            const SizedBox(height: 24),
-            Center(
-              child: Column(
-                children: [
-                  Icon(
-                    Icons.cloud_off_outlined,
-                    size: 32,
-                    color: colorScheme.outline,
-                  ),
-                  const SizedBox(height: 8),
-                  Text(
-                    'No data available',
-                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                          color: colorScheme.outline,
-                        ),
-                  ),
-                ],
+            const SizedBox(height: 8),
+            // Match sun position card height (170px content area)
+            SizedBox(
+              height: 170,
+              child: Center(
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  children: [
+                    Icon(
+                      Icons.cloud_off_outlined,
+                      size: 32,
+                      color: colorScheme.outline,
+                    ),
+                    const SizedBox(height: 8),
+                    Text(
+                      'No data available',
+                      style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                            color: colorScheme.outline,
+                          ),
+                    ),
+                  ],
+                ),
               ),
             ),
-            const SizedBox(height: 16),
           ],
         ),
       ),

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.5.1+1
+version: 1.5.3+1
 
 environment:
   sdk: ^3.10.4