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  /** Galileo system time scale.
20   * <p>By convention, TGST = UTC + 13s at Galileo epoch (1999-08-22T00:00:00Z).</p>
21   * <p>This is intended to be accessed thanks to {@link TimeScales},
22   * so there is no public constructor.</p>
23   * <p>
24   * Galileo System Time and GPS time are very close scales. Without any errors, they
25   * should be identical. The offset between these two scales is the GGTO, it depends
26   * on the clocks used to realize the time scales. It is of the order of a few
27   * tens nanoseconds. This class does not implement this offset, so it is virtually
28   * identical to the {@link GPSScale GPS scale}.
29   * </p>
30   * @author Luc Maisonobe
31   * @see AbsoluteDate
32   */
33  public class GalileoScale extends ConstantOffsetTimeScale {
34  
35      /** Serializable UID. */
36      private static final long serialVersionUID = 20240720L;
37  
38      /** Package private constructor for the factory.
39       */
40      GalileoScale() {
41          super("GST", new TimeOffset(-19L, 0L));
42      }
43  
44  }