diff --git a/include/boost/astronomy/coordinate/coord_sys/alt_az.hpp b/include/boost/astronomy/coordinate/ref_frame/alt_az.hpp
similarity index 100%
rename from include/boost/astronomy/coordinate/coord_sys/alt_az.hpp
rename to include/boost/astronomy/coordinate/ref_frame/alt_az.hpp
diff --git a/include/boost/astronomy/coordinate/ref_frame/frame.hpp b/include/boost/astronomy/coordinate/ref_frame/frame.hpp
index c1382fc3..de2ed55a 100644
--- a/include/boost/astronomy/coordinate/ref_frame/frame.hpp
+++ b/include/boost/astronomy/coordinate/ref_frame/frame.hpp
@@ -8,13 +8,13 @@ file License.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 #ifndef BOOST_ASTRONOMY_COORDINATE_FRAME_HPP
 #define BOOST_ASTRONOMY_COORDINATE_FRAME_HPP  
 
-#include <boost/astronomy/coordinate/coord_sys/alt_az.hpp>
+#include <boost/astronomy/coordinate/ref_frame/alt_az.hpp>
 #include <boost/astronomy/coordinate/ref_frame/cirs.hpp>
-#include <boost/astronomy/coordinate/coord_sys/galactic.hpp>
-#include <boost/astronomy/coordinate/coord_sys/geocentric.hpp>
-#include <boost/astronomy/coordinate/coord_sys/heliocentric.hpp>
+#include <boost/astronomy/coordinate/ref_frame/galactic.hpp>
+#include <boost/astronomy/coordinate/ref_frame/geocentric.hpp>
+#include <boost/astronomy/coordinate/ref_frame/heliocentric.hpp>
 #include <boost/astronomy/coordinate/ref_frame/icrs.hpp>
-#include <boost/astronomy/coordinate/coord_sys/supergalactic.hpp>
+#include <boost/astronomy/coordinate/ref_frame/supergalactic.hpp>
 
 #endif // !BOOST_ASTRONOMY_COORDINATE_FRAME_HPP
 
diff --git a/include/boost/astronomy/coordinate/coord_sys/galactic.hpp b/include/boost/astronomy/coordinate/ref_frame/galactic.hpp
similarity index 100%
rename from include/boost/astronomy/coordinate/coord_sys/galactic.hpp
rename to include/boost/astronomy/coordinate/ref_frame/galactic.hpp
diff --git a/include/boost/astronomy/coordinate/coord_sys/geocentric.hpp b/include/boost/astronomy/coordinate/ref_frame/geocentric.hpp
similarity index 100%
rename from include/boost/astronomy/coordinate/coord_sys/geocentric.hpp
rename to include/boost/astronomy/coordinate/ref_frame/geocentric.hpp
diff --git a/include/boost/astronomy/coordinate/coord_sys/heliocentric.hpp b/include/boost/astronomy/coordinate/ref_frame/heliocentric.hpp
similarity index 100%
rename from include/boost/astronomy/coordinate/coord_sys/heliocentric.hpp
rename to include/boost/astronomy/coordinate/ref_frame/heliocentric.hpp
diff --git a/include/boost/astronomy/coordinate/coord_sys/supergalactic.hpp b/include/boost/astronomy/coordinate/ref_frame/supergalactic.hpp
similarity index 100%
rename from include/boost/astronomy/coordinate/coord_sys/supergalactic.hpp
rename to include/boost/astronomy/coordinate/ref_frame/supergalactic.hpp