diff --git a/src/angle.rs b/src/angle.rs
index cfa6c13..869a6fc 100644
--- a/src/angle.rs
+++ b/src/angle.rs
@@ -1,3 +1,4 @@
+use core::cmp::{Eq, Ord};
 use core::f64::consts::pi;
 use num::cast::*;
 use vec::Vec3;
@@ -7,7 +8,8 @@ pub trait Angle<T>: Add<self,self>
                   , Mul<T,self>
                   , Div<T,self>
                   , Modulo<T,self>
-                  , Neg<self> {
+                  , Neg<self>
+                  , Eq, Ord {
     pure fn to_radians() -> Radians<T>;
     pure fn to_degrees() -> Degrees<T>;
 }
@@ -26,6 +28,18 @@ pub impl<T:Copy Num NumCast> Radians<T>: Angle<T> {
     #[inline(always)] pure fn neg()                 -> Radians<T> { Radians(-*self) }
 }
 
+pub impl<T:Copy Eq> Radians<T>: Eq {
+    #[inline(always)] pure fn eq(other: &Radians<T>) -> bool { *self == **other }
+    #[inline(always)] pure fn ne(other: &Radians<T>) -> bool { *self != **other }
+}
+
+pub impl<T:Copy Ord> Radians<T>: Ord {
+    #[inline(always)] pure fn lt(other: &Radians<T>) -> bool { *self <  **other }
+    #[inline(always)] pure fn le(other: &Radians<T>) -> bool { *self <= **other }
+    #[inline(always)] pure fn ge(other: &Radians<T>) -> bool { *self >= **other }
+    #[inline(always)] pure fn gt(other: &Radians<T>) -> bool { *self >  **other }
+}
+
 pub enum Degrees<T> = T;
 
 pub impl<T:Copy Num NumCast> Degrees<T>: Angle<T> {
@@ -40,6 +54,18 @@ pub impl<T:Copy Num NumCast> Degrees<T>: Angle<T> {
     #[inline(always)] pure fn neg()                 -> Degrees<T> { Degrees(-*self) }
 }
 
+pub impl<T:Copy Eq> Degrees<T>: Eq {
+    #[inline(always)] pure fn eq(other: &Degrees<T>) -> bool { *self == **other }
+    #[inline(always)] pure fn ne(other: &Degrees<T>) -> bool { *self != **other }
+}
+
+pub impl<T:Copy Ord> Degrees<T>: Ord {
+    #[inline(always)] pure fn lt(other: &Degrees<T>) -> bool { *self <  **other }
+    #[inline(always)] pure fn le(other: &Degrees<T>) -> bool { *self <= **other }
+    #[inline(always)] pure fn ge(other: &Degrees<T>) -> bool { *self >= **other }
+    #[inline(always)] pure fn gt(other: &Degrees<T>) -> bool { *self >  **other }
+}
+
 pub struct AxialRotation<T> {
     axis: Vec3<T>,
     theta: Radians<T>,