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16c62a97d5
- 新增时标、ΔT 模型、质心时间与 UT1 支持 - 改进日月食、月掩、行星事件及路径边界计算 - 完善恒星三维自行与动态距离传播 - 扩展 SVG、GeoJSON、KML 输出与底层距离换算工具 - 整理中英文手册、示例资源及回归测试
103 lines
3.9 KiB
Go
103 lines
3.9 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 TestSolarEclipse20120521CentralBandIsContinuousCriticalEnvelope(t *testing.T) {
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seed := JDCalc(2012, 5, 21)
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result := SolarEclipsePartialFootprints(seed, SolarEclipsePartialFootprintOptions{
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StepDays: 2.0 / 1440.0, BoundaryPoints: 96,
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})
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if result.Eclipse.Type != SolarEclipseAnnular ||
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result.Eclipse.Centrality != SolarEclipseCentralTwoLimits {
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t.Fatalf("eclipse=%s/%s, want two-limit annular", result.Eclipse.Type, result.Eclipse.Centrality)
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}
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if len(result.CentralBandSegments) != 1 {
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t.Fatalf("central-band segments=%d, want one continuous envelope", len(result.CentralBandSegments))
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}
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ring := result.CentralBandSegments[0]
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if len(ring) < 4 || solarEclipsePathDistanceKM(ring[0], ring[len(ring)-1]) > 0.01 {
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t.Fatal("central-band envelope is not closed")
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}
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solver := newSolarEclipseSolver(CalcMoonSHByJDE(seed, 0), SolarEclipseModelNASABulletinSplitK)
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interiorPoints := 0
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for index, point := range ring {
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if index > 0 {
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if distance := solarEclipsePathDistanceKM(ring[index-1], point); distance >
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solarEclipseCentralEnvelopeMaxSpacingKM+1e-6 {
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t.Fatalf("central-band edge %d is %.3f km, want at most %.3f km",
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index-1, distance, solarEclipseCentralEnvelopeMaxSpacingKM)
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}
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}
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if solarEclipseCentralEnvelopePointOnHorizonClosure(
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point, result.CentralBandHorizonClosures,
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) {
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continue
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}
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residual, ok := solarEclipseNonCentralBandBoundaryResidualAt(
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solver.magnitudeEvaluationAt(point.JDE), point.Longitude, point.Latitude,
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)
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if !ok || math.Abs(residual[0]) > 1e-6 ||
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math.Abs(residual[1]) > solarEclipseNonCentralBandDerivativeTolerance {
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t.Fatalf("central-band point %d altitude=%g residual=(%g,%g), want critical-envelope solution",
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index, point.SunAltitude, residual[0], residual[1])
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}
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interiorPoints++
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}
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if interiorPoints < 100 {
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t.Fatalf("critical-envelope points=%d, want a densely sampled continuous boundary", interiorPoints)
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}
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// NADC 3D eclipse data publishes these samples on the two 2012 central
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// limits. The allowance covers ephemeris/delta-T model differences and the
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// finite spacing between our continuation samples.
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for _, anchor := range []struct {
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name string
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point SolarEclipsePathPoint
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}{
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{name: "north limit", point: SolarEclipsePathPoint{Longitude: 120.9238, Latitude: 24.6531}},
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{name: "south limit", point: SolarEclipsePathPoint{Longitude: 120.3071, Latitude: 27.5328}},
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} {
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nearest := math.Inf(1)
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for _, point := range ring {
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nearest = math.Min(nearest, solarEclipsePathDistanceKM(point, anchor.point))
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}
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if nearest > 60 {
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t.Fatalf("central-band %s is %.3f km from the NADC reference sample", anchor.name, nearest)
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}
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}
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}
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func TestSolarEclipseCentralEnvelopeIndependentOfRiseSetOutput(t *testing.T) {
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seed := JDCalc(2012, 5, 21)
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withCurves := SolarEclipsePartialFootprints(seed, SolarEclipsePartialFootprintOptions{StepDays: 2.0 / 1440, BoundaryPoints: 96})
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withoutCurves := SolarEclipsePartialFootprints(seed, SolarEclipsePartialFootprintOptions{StepDays: 2.0 / 1440, BoundaryPoints: 96, DisableRiseSetCurves: true})
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if len(withoutCurves.CentralBandSegments) == 0 {
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t.Fatal("disabling output curves removed the authoritative central envelope")
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}
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if len(withoutCurves.RiseSetCurves) != 0 {
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t.Fatal("disabled rise/set curves were returned")
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}
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if len(withCurves.CentralBandSegments) != len(withoutCurves.CentralBandSegments) {
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t.Fatalf("central envelope segment count changed: %d vs %d", len(withCurves.CentralBandSegments), len(withoutCurves.CentralBandSegments))
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}
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}
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func solarEclipseCentralEnvelopePointOnHorizonClosure(
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point SolarEclipsePathPoint,
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closures [][]SolarEclipsePathPoint,
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) bool {
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for _, closure := range closures {
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for _, horizonPoint := range closure {
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if solarEclipsePathDistanceKM(point, horizonPoint) <= 0.001 &&
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math.Abs(point.JDE-horizonPoint.JDE) <= solarEclipsePathDuplicateTimeDays {
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return true
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}
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}
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}
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return false
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}
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