diff --git a/src/nature.rs b/src/nature.rs
index 6d16b69..a873c25 100644
--- a/src/nature.rs
+++ b/src/nature.rs
@@ -84,19 +84,20 @@ pub fn ring_density(radius: f32) -> f32 {
 }
 
 pub fn readable_distance(distance: f64) -> String {
-    if distance > LIGHTYEAR2METER * 0.001 {
+    let abs_distance = distance.abs();
+    if abs_distance > LIGHTYEAR2METER * 0.001 {
         let lightyears = distance / LIGHTYEAR2METER;
         return format!("{lightyears:.3}ly");
     }
-    if distance >= 1.0e10 {
+    if abs_distance >= 1.0e10 {
         let gigameters = distance * 1.0e-9;
         return format!("{gigameters:.1}Gm");
     }
-    if distance >= 1.0e7 {
+    if abs_distance >= 1.0e7 {
         let megameters = distance * 1.0e-6;
         return format!("{megameters:.1}Mm");
     }
-    if distance >= 1.0e4 {
+    if abs_distance >= 1.0e4 {
         let kilometers = distance * 1.0e-3;
         return format!("{kilometers:.1}km");
     }