diff --git a/Resources/shader.frag b/Resources/shader.frag
index 291ab4d..56edd6f 100644
--- a/Resources/shader.frag
+++ b/Resources/shader.frag
@@ -1,6 +1,6 @@
 uniform vec2 resolution;
 uniform float time;
-uniform float night;
+uniform float hour;
 
 float rand(vec2 n) { 
     return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
@@ -39,9 +39,8 @@ void main(void) {
     else uv.y -= abs(time * 0.1);
     vec3 colorPink = vec3(255.,0.,255.);
     vec3 colorBlue = vec3(0.,255.,255.);
-    vec4 color = vec4(((colorPink.x*night) + (colorBlue.x*(1.-night)))/2., 
-                      ((colorPink.y*night) + (colorBlue.y*(1.-night)))/2., 
-                      ((colorPink.z*night) + (colorBlue.z*(1.-night)))/2., 255) / 255.;
-//     color = vec4(122.,202.,255.,255.)/ 255.;
+    vec4 color = vec4(((colorBlue.x*hour) + (colorPink.x*(1.-hour)))/2., 
+                      ((colorBlue.y*hour) + (colorPink.y*(1.-hour)))/2., 
+                      ((colorBlue.z*hour) + (colorPink.z*(1.-hour)))/2., 255) / 255.;
     gl_FragColor = (grid(fract(uv))) * color - line(umuv.y, 0., 0.175, 0.025) * color * 2.;
 }
\ No newline at end of file
diff --git a/VaporWaveWars/combat.cpp b/VaporWaveWars/combat.cpp
index 4044e30..3a85d20 100644
--- a/VaporWaveWars/combat.cpp
+++ b/VaporWaveWars/combat.cpp
@@ -66,8 +66,9 @@ float isNight() {
      struct tm * ptm;
      time ( &rawtime );
      ptm = gmtime ( &rawtime );
-
-     return (float ((ptm->tm_hour+UTC)%24))/(23.);
+     float hour = (float ((ptm->tm_hour+UTC)%24))/(23.);
+     float result = (std::cos(hour*(2*PI)) + 1.f)/2.;
+     return result;
 }
 
 void Combat::initShader() {
@@ -78,7 +79,7 @@ void Combat::initShader() {
     _shader.loadFromFile(WORK_DIR+"Resources/shader.frag", sf::Shader::Fragment);
     _shader.setParameter("resolution", sf::Vector2f(W_WIDTH, W_HEIGHT));
     _shader.setParameter("time", time);
-    _shader.setParameter("night", isNight());
+    _shader.setParameter("hour", isNight());
 
     ASSERT(_haloT.loadFromFile(WORK_DIR+"Resources/platform-halo.png"));
     _halo.setTexture(_haloT);
diff --git a/VaporWaveWars/combat.hpp b/VaporWaveWars/combat.hpp
index e5bec64..0532960 100644
--- a/VaporWaveWars/combat.hpp
+++ b/VaporWaveWars/combat.hpp
@@ -12,7 +12,8 @@
 #include "wave.hpp"
 #include <time.h>
 
-#define UTC (0)
+#define PI 3.14159265
+
 
 class Combat : public Scene {
 
diff --git a/VaporWaveWars/commons.hpp b/VaporWaveWars/commons.hpp
index 881d329..78341c9 100644
--- a/VaporWaveWars/commons.hpp
+++ b/VaporWaveWars/commons.hpp
@@ -16,6 +16,8 @@ const int SCENE_NUM = 4;
 #define MARGEERR 0.25f
 #define BLACKVALUE 0.4f
 #define W_WIDTH  1024
+
+#define UTC (0)
 #define W_HEIGHT 768
 const std::string WORK_DIR(getenv("WORK_DIR"));