diff --git a/coord/ops.hpp b/coord/ops.hpp
index 5f7dbe91..e6cf7c1a 100644
--- a/coord/ops.hpp
+++ b/coord/ops.hpp
@@ -1476,6 +1476,21 @@ namespace cruft {
         std::fill_n (std::begin (res) + K::elements - places, places, fill);
         return res;
     }
+
+
+    //-------------------------------------------------------------------------
+    template <
+        std::size_t S,
+        typename T
+    >
+    vector<S,T>
+    to_radians (vector<S,T> const &val)
+    {
+        return ::cruft::invoke<vector<S,T>> (
+            ::cruft::sin<T>,
+            val
+        );
+    }
 };
 
 
diff --git a/vector.hpp b/vector.hpp
index ed224485..05181fc3 100644
--- a/vector.hpp
+++ b/vector.hpp
@@ -3,7 +3,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  *
- * Copyright 2011-2017 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2011-2019 Danny Robson <danny@nerdcruft.net>
  */
 
 #ifndef CRUFT_UTIL_VECTOR_HPP