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
81 lines
2.8 KiB
Go
81 lines
2.8 KiB
Go
package orbit
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import (
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"math"
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"testing"
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"time"
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"b612.me/astro/basic"
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)
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func TestDistancePhaseAndElongationHelpers(t *testing.T) {
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elements := sampleObservationElements()
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date := time.Date(2025, 11, 21, 20, 0, 0, 0, time.UTC)
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sunDistance := SunDistance(date, elements)
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earthDistance := EarthDistance(date, elements)
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phaseAngle := PhaseAngle(date, elements)
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illuminatedFraction := IlluminatedFraction(date, elements)
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phase := Phase(date, elements)
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elongation := Elongation(date, elements)
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for name, value := range map[string]float64{
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"sunDistance": sunDistance,
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"earthDistance": earthDistance,
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"phaseAngle": phaseAngle,
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"illuminatedFraction": illuminatedFraction,
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"phase": phase,
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"elongation": elongation,
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} {
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if math.IsNaN(value) || math.IsInf(value, 0) {
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t.Fatalf("%s is not finite: %.18f", name, value)
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}
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}
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if math.Abs(sunDistance-HeliocentricEclipticJ2000(date, elements).Distance) > 1e-12 {
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t.Fatalf("sun distance mismatch: got %.15f want %.15f", sunDistance, HeliocentricEclipticJ2000(date, elements).Distance)
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}
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if math.Abs(earthDistance-GeocentricEclipticJ2000(date, elements).Distance) > 1e-12 {
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t.Fatalf("earth distance mismatch: got %.15f want %.15f", earthDistance, GeocentricEclipticJ2000(date, elements).Distance)
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}
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if phaseAngle < 0 || phaseAngle > 180 {
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t.Fatalf("phase angle out of range: %.12f", phaseAngle)
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}
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if elongation < 0 || elongation > 180 {
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t.Fatalf("elongation out of range: %.12f", elongation)
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}
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if illuminatedFraction < 0 || illuminatedFraction > 1 {
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t.Fatalf("illuminated fraction out of range: %.12f", illuminatedFraction)
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}
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if math.Abs(phase-illuminatedFraction) > 1e-12 {
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t.Fatalf("phase alias mismatch: phase=%.15f illuminated=%.15f", phase, illuminatedFraction)
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}
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wantIlluminatedFraction := (1 + math.Cos(phaseAngle*math.Pi/180)) / 2
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if math.Abs(illuminatedFraction-wantIlluminatedFraction) > 1e-12 {
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t.Fatalf("illuminated fraction mismatch: got %.15f want %.15f", illuminatedFraction, wantIlluminatedFraction)
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}
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jd := ttJulianDay(date)
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wantPhaseAngle := math.Acos(clampUnitLocal((sunDistance*sunDistance+earthDistance*earthDistance-basic.EarthAway(jd)*basic.EarthAway(jd))/(2*sunDistance*earthDistance))) * 180 / math.Pi
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if math.Abs(phaseAngle-wantPhaseAngle) > 1e-12 {
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t.Fatalf("phase angle mismatch: got %.15f want %.15f", phaseAngle, wantPhaseAngle)
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}
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objectLon, objectLat, _ := basic.OrbitApparentGeocentricEcliptic(jd, toBasicElements(elements))
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wantElongation := basic.StarAngularSeparation(objectLon, objectLat, basic.HSunApparentLo(jd), basic.HSunTrueBo(jd))
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if math.Abs(elongation-wantElongation) > 1e-12 {
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t.Fatalf("elongation mismatch: got %.15f want %.15f", elongation, wantElongation)
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}
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}
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func clampUnitLocal(value float64) float64 {
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if value > 1 {
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return 1
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}
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if value < -1 {
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return -1
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}
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return value
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}
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