Added ITRF equinox, for applications that rely on it...

src/main/java/org/orekit/rugged/api/Rugged.java

@@ -67,6 +67,9 @@ public interface Rugged {
         /** Constant for International Terrestrial Reference Frame. */
         ITRF,
 
+        /** Constant for International Terrestrial Reference Frame based on older equinox paradigm. */
+        ITRF_EQUINOX,
+
         /** Constant for Geocentric True Of Date frame. */
         GTOD
 

src/main/java/org/orekit/rugged/core/RuggedImpl.java

@@ -246,6 +246,8 @@ public class RuggedImpl implements Rugged {
         switch (bodyRotatingFrame) {
         case ITRF :
             return FramesFactory.getITRF(IERSConventions.IERS_2010, true);
+        case ITRF_EQUINOX :
+            return FramesFactory.getITRFEquinox(IERSConventions.IERS_1996, true);
         case GTOD :
             return FramesFactory.getGTOD(IERSConventions.IERS_1996, true);
         default :