starainrt
3ffdbe0034
- 新增日食、月食、本地可见性、中心线、半影区域、SVG 图示与沙罗周期信息 - 新增行星冲合、留、方照、物理星历、视直径、相位、亮肢角、轨道节点等计算 - 新增木星伽利略卫星位置、现象与接触事件计算 - 新增恒星星表、星座判定、自行修正与观测辅助能力 - 新增 coord、formula、orbit、sundial、lite/sun、lite/moon 等扩展包 - 完善农历年号、月相英文别名、视差角、大气质量、折射、日晷与双星计算 - 增加 NASA、JPL Horizons、IMCCE 等回归测试数据与基线测试 - 重构基础算法文件组织，补充大量公开 API 注释和语义回归测试 - 更新中文和英文 README，补充示例、精度说明、SVG 配图
127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
package basic
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import (
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"math"
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"testing"
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)
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func TestOrbitCircularStateAtEpoch(t *testing.T) {
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elements := OrbitElements{
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EpochJD: orbitReferenceJD,
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A: 2,
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E: 0,
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I: 0,
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Omega: 0,
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W: 0,
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M0: 0,
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}
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vector := OrbitHeliocentricXYZJ2000(orbitReferenceJD, elements)
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assertSameFloat(t, "x", vector[0], 2)
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assertSameFloat(t, "y", vector[1], 0)
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assertSameFloat(t, "z", vector[2], 0)
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lon, lat, distance := OrbitHeliocentricEclipticJ2000(orbitReferenceJD, elements)
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assertSameFloat(t, "lon", lon, 0)
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assertSameFloat(t, "lat", lat, 0)
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assertSameFloat(t, "distance", distance, 2)
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}
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func TestOrbitQuarterPeriodOnCircularOrbit(t *testing.T) {
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elements := OrbitElements{
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EpochJD: orbitReferenceJD,
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A: 1,
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E: 0,
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I: 0,
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Omega: 0,
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W: 0,
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M0: 0,
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}
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quarterPeriodDays := 90 / OrbitMeanMotion(elements)
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vector := OrbitHeliocentricXYZJ2000(orbitReferenceJD+quarterPeriodDays, elements)
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if math.Abs(vector[0]) > 1e-10 || math.Abs(vector[1]-1) > 1e-10 || math.Abs(vector[2]) > 1e-10 {
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t.Fatalf("quarter-period vector mismatch: got %+v", vector)
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}
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}
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func TestOrbitMeanAndTrueAnomalyCircularMatch(t *testing.T) {
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elements := OrbitElements{
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EpochJD: orbitReferenceJD,
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A: 1.523679,
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E: 0,
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I: 1.85,
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Omega: 49.5,
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W: 286.5,
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M0: 123.4,
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}
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jd := orbitReferenceJD + 123.456
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meanAnomaly := OrbitMeanAnomaly(jd, elements)
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trueAnomaly := OrbitTrueAnomaly(jd, elements)
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if math.Abs(meanAnomaly-trueAnomaly) > 1e-12 {
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t.Fatalf("circular mean/true anomaly mismatch: mean=%.18f true=%.18f", meanAnomaly, trueAnomaly)
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}
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}
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func TestPerihelionFormMatchesClassicalEllipticState(t *testing.T) {
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classical := OrbitElements{
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EpochJD: 2457305.5,
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A: 3.462249489765068,
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E: 0.6409081306555051,
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I: 7.040294906760007,
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Omega: 50.13557380441372,
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W: 12.79824973415729,
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M0: 8.859927418758764,
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}
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perihelion := OrbitElements{
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Q: 1.243265641416762,
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E: classical.E,
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I: classical.I,
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Omega: classical.Omega,
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W: classical.W,
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TpJD: 2457247.588657863465,
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}
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jd := 2457308.5
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classicalVector := OrbitHeliocentricXYZJ2000(jd, classical)
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perihelionVector := OrbitHeliocentricXYZJ2000(jd, perihelion)
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for i := range classicalVector {
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if math.Abs(classicalVector[i]-perihelionVector[i]) > 1e-11 {
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t.Fatalf("component %d mismatch: classical=%.18f perihelion=%.18f", i, classicalVector[i], perihelionVector[i])
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}
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}
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}
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func TestParabolicPerihelionStateAtTp(t *testing.T) {
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elements := OrbitElements{Q: 1, E: 1, I: 0, Omega: 0, W: 0, TpJD: orbitReferenceJD}
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vector := OrbitHeliocentricXYZJ2000(orbitReferenceJD, elements)
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assertSameFloat(t, "x", vector[0], 1)
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assertSameFloat(t, "y", vector[1], 0)
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assertSameFloat(t, "z", vector[2], 0)
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if !math.IsNaN(OrbitMeanAnomaly(orbitReferenceJD, elements)) {
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t.Fatalf("parabolic mean anomaly should be NaN")
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}
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}
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func TestHyperbolicOrbitProducesFiniteState(t *testing.T) {
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elements := OrbitElements{Q: 0.5, E: 1.2, I: 12, Omega: 30, W: 45, TpJD: orbitReferenceJD}
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vector := OrbitHeliocentricXYZJ2000(orbitReferenceJD+20, elements)
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for i, component := range vector {
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if math.IsNaN(component) || math.IsInf(component, 0) {
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t.Fatalf("component %d not finite: %.18f", i, component)
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}
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}
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}
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func TestOrbitInvalidEllipticElementsReturnNaN(t *testing.T) {
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elements := OrbitElements{EpochJD: orbitReferenceJD, A: 1, E: 1.1}
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if !math.IsNaN(OrbitMeanMotion(elements)) {
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t.Fatalf("expected NaN mean motion for invalid elements")
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}
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vector := OrbitHeliocentricXYZJ2000(orbitReferenceJD, elements)
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for i, component := range vector {
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if !math.IsNaN(component) {
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t.Fatalf("component %d expected NaN, got %.18f", i, component)
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}
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}
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}
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