Index: Common.h
===================================================================
diff -u -re8828d66e4a76e0590c3f06b7f6235f33df64e80 -rb6692fc38b400e9f2c12520fcadc2438e5a31e36
--- Common.h	(.../Common.h)	(revision e8828d66e4a76e0590c3f06b7f6235f33df64e80)
+++ Common.h	(.../Common.h)	(revision b6692fc38b400e9f2c12520fcadc2438e5a31e36)
@@ -105,6 +105,7 @@
 #define SEC_PER_MIN                     60          ///< # of seconds in a minute.
 #define FRACTION_TO_PERCENT_FACTOR      100.0       ///< Percentage factor (100).
 #define MIN_PER_HOUR                    60          ///< # of minutes in an hour.
+#define PI                              3.1415927   ///< PI.
 
 // **** Common Macros ****
 
@@ -126,6 +127,7 @@
 #define MAKE_LONG_OF_WORDS(h, l)        ((((U32)(h) << SHIFT_16_BITS_FOR_WORD_SHIFT) & MASK_OFF_LSW) | ((U32)(l) & MASK_OFF_MSW))   ///< Macro merges two 2-byte words into a 4-byte word.
 #define GET_TOGGLE(v, l, h)             ((v) == (l) ? (h) : (l))                                ///< Macro toggles a value.
 #define BIT_BY_POS(p)                   (1U << (p))                                             ///< Macro returns a bit mask for a bit of given position.
+#define RAD2DEG(r)                      ((r) * 180.0 / PI)                                      ///< Macro converts radians to degrees
 
 /**@}*/