diff --git a/skeleton/main b/skeleton/main
index 8ab4f3fb6ea73203ef4749761a599a71fffd5f35..c019f70a5cb130e5b443dbb74aad667e78f1bcd8 100755
Binary files a/skeleton/main and b/skeleton/main differ
diff --git a/skeleton/main.c b/skeleton/main.c
index a356c18a962d07939ae7c68a080e8b89ac2fe0f5..72c77f339e27d6fe666e03b5c28686a61cb4a6bf 100644
--- a/skeleton/main.c
+++ b/skeleton/main.c
@@ -32,7 +32,7 @@ int main()
     system_t system = create_system(planet, NB_PLANETS);
     for (uint16_t i = 0; i < NB_PLANETS; ++i) {
         system.planets[i].prec_pos=system.planets[i].pos;
-        system.planets[i].pos = vec2_add(vec2_sub(system.planets[i].pos,vec2_mul(DELTA_T, vitessePerihelie(system.planets[i],&system))),vec2_mul(pow(DELTA_T,2)/2,acceleration(system.planets[i],&system)));
+        system.planets[i].pos = postition_next(system.planets[i],DELTA_T,&system);
     }
     while (true)
     {
diff --git a/skeleton/main.o b/skeleton/main.o
index ff41c7f3ee81ecefbabbedded94ee24f5700a121..b439467dfc8e155b20087e69f726e037516eaf59 100644
Binary files a/skeleton/main.o and b/skeleton/main.o differ
diff --git a/skeleton/planet/planet.h b/skeleton/planet/planet.h
index 647095bd319d769482a19bb0f22bdc9880b50571..a6e0cff396b3b3881833408d5c6b5465c1ba0eaf 100644
--- a/skeleton/planet/planet.h
+++ b/skeleton/planet/planet.h
@@ -69,9 +69,8 @@ vec2 gravitationForce(planet_t a, planet_t b);
 vec2 force_resultante(system_t *system, planet_t p);
 vec2 vitessePerihelie(planet_t p, system_t *system);
 vec2 acceleration(planet_t p, system_t *system);
-//vec2 pos_init(planet_t p, double delta_t, system_t *system);
 vec2 postition_next(planet_t p, double delta_t, system_t *system);
-planet_t create_planet(double mass,double rayon, double excentricite, double demi_grand_axe, int color);
+planet_t create_planet(double mass,double rayon, double excentricite, double demi_grand_axe, int couleur);
 system_t create_system(planet_t *planet, int nb_);
 void show_system(struct gfx_context_t *ctxt, system_t *system, int width, int height, long resolution);
 void update_system(system_t *system, double delta_t);