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17 package org.orekit.time;
18
19 import org.junit.jupiter.api.Assertions;
20 import org.junit.jupiter.api.BeforeEach;
21 import org.junit.jupiter.api.Test;
22 import org.orekit.Utils;
23 import org.orekit.frames.ITRFVersion;
24 import org.orekit.utils.Constants;
25 import org.orekit.utils.IERSConventions;
26
27
28 public class TCGScaleTest {
29
30 @Test
31 public void testRatio() {
32 TimeScale scale = TimeScalesFactory.getTCG();
33 Assertions.assertEquals("TCG", scale.toString());
34 final double dtTT = 1e6;
35 final AbsoluteDate t1 = AbsoluteDate.J2000_EPOCH;
36 final AbsoluteDate t2 = t1.shiftedBy(dtTT);
37 final double dtTCG = dtTT + scale.offsetFromTAI(t2).subtract(scale.offsetFromTAI(t1)).toDouble();
38 Assertions.assertEquals(1 - 6.969290134e-10, dtTT / dtTCG, 1.0e-15);
39 }
40
41 @Test
42 public void testSymmetry() {
43 TimeScale scale = TimeScalesFactory.getTCG();
44 for (double dt = -10000; dt < 10000; dt += 123.456789) {
45 AbsoluteDate date = AbsoluteDate.J2000_EPOCH.shiftedBy(dt * Constants.JULIAN_DAY);
46 double dt1 = scale.offsetFromTAI(date).toDouble();
47 DateTimeComponents components = date.getComponents(scale);
48 double dt2 = scale.offsetToTAI(components.getDate(), components.getTime()).toDouble();
49 Assertions.assertEquals( 0.0, dt1 + dt2, 1.0e-10);
50 }
51 }
52
53 @Test
54 public void testDuringLeap() {
55 final TimeScale utc = TimeScalesFactory.getUTC();
56 final TimeScale scale = TimeScalesFactory.getTCG();
57 final AbsoluteDate before = new AbsoluteDate(new DateComponents(1983, 6, 30),
58 new TimeComponents(23, 59, 59),
59 utc);
60 final AbsoluteDate during = before.shiftedBy(1.25);
61 Assertions.assertEquals(61, utc.minuteDuration(during));
62 Assertions.assertEquals(1.0, utc.getLeap(during).toDouble(), 1.0e-10);
63 Assertions.assertEquals(60, scale.minuteDuration(during));
64 Assertions.assertEquals(0.0, scale.getLeap(during).toDouble(), 1.0e-10);
65 }
66
67 @Test
68 public void testReference() {
69 DateComponents referenceDate = new DateComponents(1977, 1, 1);
70 TimeComponents thirtyTwo = new TimeComponents(0, 0, new TimeOffset(32L, 184000000000000000L));
71 AbsoluteDate ttRef = new AbsoluteDate(referenceDate, thirtyTwo, TimeScalesFactory.getTT());
72 AbsoluteDate tcgRef = new AbsoluteDate(referenceDate, thirtyTwo, TimeScalesFactory.getTCG());
73 AbsoluteDate taiRef = new AbsoluteDate(referenceDate, TimeComponents.H00, TimeScalesFactory.getTAI());
74 AbsoluteDate utcRef = new AbsoluteDate(new DateComponents(1976, 12, 31),
75 new TimeComponents(23, 59, 45),
76 TimeScalesFactory.getUTC());
77 Assertions.assertEquals(0, ttRef.durationFrom(tcgRef), 1.0e-20);
78 Assertions.assertEquals(0, ttRef.durationFrom(taiRef), 1.0e-20);
79 Assertions.assertEquals(0, ttRef.durationFrom(utcRef), 1.0e-20);
80 }
81
82 @Test
83 public void testSofa() {
84 TimeScale tt = TimeScalesFactory.getTT();
85 AbsoluteDate date = new AbsoluteDate(2006, 1, 15, 21, 25, 10.5000096, tt);
86 TimeOffset delta = TimeScalesFactory.getTCG().offsetFromTAI(date).subtract(tt.offsetFromTAI(date));
87 Assertions.assertEquals(Constants.JULIAN_DAY * (0.8924900312508587113 - 0.892482639), delta.toDouble(), 5.0e-10);
88 }
89
90 @Test
91 public void testAAS06134() {
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98 Utils.setLoaders(IERSConventions.IERS_1996,
99 Utils.buildEOPList(IERSConventions.IERS_1996, ITRFVersion.ITRF_2008, new double[][] {
100 { 53098, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
101 { 53099, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
102 { 53100, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
103 { 53101, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
104 { 53102, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
105 { 53103, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
106 { 53104, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
107 { 53105, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN }
108 }));
109 AbsoluteDate date =
110 new AbsoluteDate(2004, 4, 6, 7, 51, 28.386009, TimeScalesFactory.getUTC());
111 DateTimeComponents components = date.getComponents(TimeScalesFactory.getTCG());
112 Assertions.assertEquals(2004, components.getDate().getYear());
113 Assertions.assertEquals( 4, components.getDate().getMonth());
114 Assertions.assertEquals( 6, components.getDate().getDay());
115 Assertions.assertEquals( 7, components.getTime().getHour());
116 Assertions.assertEquals( 52, components.getTime().getMinute());
117 Assertions.assertEquals( 33.1695861742, components.getTime().getSecond(), 1.0e-10);
118
119 }
120
121 @BeforeEach
122 public void setUp() {
123 Utils.setDataRoot("regular-data");
124 }
125
126 }