diff --git a/src/actor.rs b/src/actor.rs
index 384102a..b64b333 100644
--- a/src/actor.rs
+++ b/src/actor.rs
@@ -454,15 +454,14 @@ fn handle_gforce(
     mut q_actor: Query<(&LinearVelocity, &mut HitPoints, &mut ExperiencesGForce)>,
 ) {
     let dt = time.delta_seconds();
-    let factor = 1.0 / dt / 9.81;
+    let factor = 1.0 / dt / nature::EARTH_GRAVITY;
     for (v, mut hp, mut gforce) in &mut q_actor {
-        if gforce.ignore_gforce_seconds > 0.0 {
-            gforce.ignore_gforce_seconds -= dt;
-            gforce.last_linear_velocity = v.0;
-            continue;
-        }
         gforce.gforce = factor * (v.0 - gforce.last_linear_velocity).length() as f32;
         gforce.last_linear_velocity = v.0;
+        if gforce.ignore_gforce_seconds > 0.0 {
+            gforce.ignore_gforce_seconds -= dt;
+            continue;
+        }
         if gforce.gforce > gforce.damage_threshold {
             hp.damage += (gforce.gforce - gforce.damage_threshold).powf(2.0) / 3000.0;
         }
diff --git a/src/nature.rs b/src/nature.rs
index f8abec7..66a02ef 100644
--- a/src/nature.rs
+++ b/src/nature.rs
@@ -9,6 +9,7 @@ pub const OXY_H: f32 = OXYGEN_USE_KG_PER_S * 60.0 * 60.0;
 pub const OXY_D: f32 = OXYGEN_USE_KG_PER_S * 60.0 * 60.0 * 24.0;
 pub const PARSEC2METER: f64 = 3.0857e16;
 pub const DIST_JUPTER_SUN: f64 = 778479.0e6;
+pub const EARTH_GRAVITY: f32 = 9.81;
 
 pub fn star_color_index_to_rgb(color_index: f32) -> (f32, f32, f32) {
     let temperature = 4600.0 * ((1.0 / (0.92 * color_index + 1.7)) + (1.0 / (0.92 * color_index + 0.62)));