diff --git a/atmosphere/src/App.jsx b/atmosphere/src/App.jsx
index 57dbd54e7..013e6b445 100644
--- a/atmosphere/src/App.jsx
+++ b/atmosphere/src/App.jsx
@@ -30,14 +30,12 @@ const VRM_URL = `${BASE_URL}ai.vrm`;
 const VRMA_URL = `${BASE_URL}fly.vrma`;
 const EARTH_RADIUS = 6378137;
 
-// 天気変更の間隔 (ms) - 5分
 const WEATHER_INTERVAL = 5 * 60 * 1000;
 
-// 時間の進行速度 (倍率)
-const TIME_SCALE = 100;
+const TIME_SCALE = 10;
 
 // 初期時刻: 正午 (12:00)
-const INITIAL_DATE = new Date('2024-06-21T12:00:00');
+const INITIAL_DATE = new Date('2024-06-21T16:00:00');
 
 // --- Weather Presets (天候設定) ---
 const WEATHER_PRESETS = [
@@ -237,17 +235,12 @@ function AtmosphereScene() {
 
   // 3. 時間進行と太陽移動 (Canvas内なのでuseFrameが使える)
   useFrame((state, delta) => {
-    // 時間を進める
     const currentDate = dateRef.current;
     const elapsedMs = delta * TIME_SCALE * 1000;
     currentDate.setTime(currentDate.getTime() + elapsedMs);
-
-    // Atmosphere更新
     if (atmosphereRef.current) {
       atmosphereRef.current.updateByDate(currentDate);
     }
-
-    // 太陽移動
     if (sunRef.current) {
       const hours = currentDate.getHours() + currentDate.getMinutes() / 60 + currentDate.getSeconds() / 3600;
       const sunAngle = MathUtils.mapLinear(hours, 6, 18, 0, Math.PI);
@@ -256,7 +249,7 @@ function AtmosphereScene() {
 
       if (hours < 6 || hours > 18) {
         sunRef.current.position.set(0, -1, 0);
-        sunRef.current.intensity = 0.0;
+        sunRef.current.intensity = 10.0;
       } else {
         sunRef.current.position.set(sunX, sunY, 0.2);
         sunRef.current.intensity = MathUtils.lerp(0.5, 3.0, sunY);