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diff --git a/src/mathconstants.h b/src/mathconstants.h
index 78d7d70..c180d14 100644
--- a/src/mathconstants.h
+++ b/src/mathconstants.h
@@ -14,6 +14,7 @@
 // JLH  04/01/2011  Created this file
 //
 
-#define PI 3.14159265358979323846264338327
+#define PI                 3.14159265358979323846264338327
+#define PI_OVER_2          (PI / 2.0)
 #define RADIANS_TO_DEGREES (180.0 / PI)
 #define DEGREES_TO_RADIANS (PI / 180.0)