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 = 20240321L;
37
38 /** Package private constructor for the factory.
39 */
40 GalileoScale() {
41 super("GST", -19);
42 }
43
44 }