Extend positions with getters to retrieve lat/lon in radians

src/position.rs

@@ -55,6 +55,16 @@ impl Position {
     pub(crate) fn lon_as_str(&self, precision: usize) -> String {
         format!("{:.*}", precision, self.lon)
     }
+
+    /// Returns the latitude in radians
+    fn lat_as_rad(&self) -> f64 {
+        self.lat * PI / 180.0
+    }
+
+    /// Returns the longitude in radians
+    fn lon_as_rad(&self) -> f64 {
+        self.lon * PI / 180.0
+    }
 }
 
 impl From<&Point<f64>> for Position {