1   /* Copyright 2002-2024 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.time;
18  
19  /** Terrestrial Time as defined by IAU(1991) recommendation IV.
20   * <p>Coordinate time at the surface of the Earth. IT is the
21   * successor of Ephemeris Time TE.</p>
22   * <p>By convention, TT = TAI + 32.184 s.</p>
23   * <p>This is intended to be accessed thanks to {@link TimeScales},
24   * so there is no public constructor.</p>
25   * @author Luc Maisonobe
26   * @see AbsoluteDate
27   */
28  public class TTScale extends ConstantOffsetTimeScale {
29  
30      /** Serializable UID. */
31      private static final long serialVersionUID = 20240720L;
32  
33      /** Package private constructor for the factory.
34       */
35      TTScale() {
36          super("TT", new TimeOffset(32L, TimeOffset.SECOND, 184L, TimeOffset.MILLISECOND));
37      }
38  
39  }