70 lines
2.9 KiB
Go
70 lines
2.9 KiB
Go
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package eclipse
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import (
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"fmt"
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"math"
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"testing"
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"time"
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)
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func lunarPanelTestRA(degrees float64) string {
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total := math.Mod(degrees, 360) / 15
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hours := math.Floor(total)
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minutes := math.Floor((total - hours) * 60)
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return fmt.Sprintf("%02.0fh%02.0fm%04.1fs", hours, minutes, ((total-hours)*60-minutes)*60)
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}
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func lunarPanelTestDec(degrees float64) string {
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sign := "+"
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if degrees < 0 {
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sign, degrees = "-", -degrees
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}
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whole := math.Floor(degrees)
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minutes := math.Floor((degrees - whole) * 60)
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seconds := ((degrees-whole)*60 - minutes) * 60
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return fmt.Sprintf("%s%02.0f\u00b0%02.0f'%04.1f\"", sign, whole, minutes, seconds)
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}
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// 地心量面板要与 NASA 月食图 LE2025Mar14T 逐项对得上。
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func TestLunarEclipseGeocentricPanelMatchesNASABulletin(t *testing.T) {
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panel, ok := LunarEclipseGeocentricPanelAt(time.Date(2025, time.March, 14, 0, 0, 0, 0, time.UTC))
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if !ok {
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t.Fatal("missing eclipse")
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}
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t.Logf("望(黄经相差180°) %s UT", panel.FullMoon.UTC().Format("15:04:05.0"))
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t.Logf("太阳 R.A. %s Dec. %s S.D. %.1f\" H.P. %.1f\"",
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lunarPanelTestRA(panel.SunRightAscensionDeg), lunarPanelTestDec(panel.SunDeclinationDeg),
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panel.SunSemidiameterArcsec, panel.SunParallaxArcsec)
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t.Logf("月亮 R.A. %s Dec. %s S.D. %.1f\" H.P. %.1f\"",
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lunarPanelTestRA(panel.MoonRightAscensionDeg), lunarPanelTestDec(panel.MoonDeclinationDeg),
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panel.MoonSemidiameterArcsec, panel.MoonParallaxArcsec)
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t.Logf("Gamma %.4f Axis %.4f° P.R %.4f° U.R %.4f° 食分 %.4f / %.4f ΔT %.1f s %s",
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panel.Gamma, panel.AxisDegrees, panel.PenumbralRadiusDegrees, panel.UmbralRadiusDegrees,
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panel.UmbralMagnitude, panel.PenumbralMagnitude, panel.DeltaTSeconds, panel.Ephemeris)
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// NASA: Ecliptic Conjunction 06:54:33.5 UT。
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conjunction := time.Date(2025, time.March, 14, 6, 54, 33, 0, time.UTC)
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if delta := panel.FullMoon.UTC().Sub(conjunction).Seconds(); math.Abs(delta) > 15 {
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t.Fatalf("full moon differs from NASA's ecliptic conjunction by %.1f s", delta)
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}
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// NASA: Gamma 0.3481、Axis 0.3171、P.R 1.1899、U.R 0.6537、食分 1.1784 / 2.2595。
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for _, check := range []struct {
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name string
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got float64
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want float64
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}{{"Gamma", panel.Gamma, 0.3481}, {"Axis", panel.AxisDegrees, 0.3171},
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{"P.Radius", panel.PenumbralRadiusDegrees, 1.1899}, {"U.Radius", panel.UmbralRadiusDegrees, 0.6537},
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{"umbral magnitude", panel.UmbralMagnitude, 1.1784}, {"penumbral magnitude", panel.PenumbralMagnitude, 2.2595},
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{"moon S.D.", panel.MoonSemidiameterArcsec, 892.8}, {"moon H.P.", panel.MoonParallaxArcsec, 3276.8},
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{"sun S.D.", panel.SunSemidiameterArcsec, 965.2}, {"sun H.P.", panel.SunParallaxArcsec, 8.9}} {
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if math.Abs(check.got-check.want) > 1.0 {
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t.Errorf("%s = %.4f, want %.4f", check.name, check.got, check.want)
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}
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}
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// Gamma 与 Axis 必须互为两种刻度。
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parallax := panel.MoonParallaxArcsec / 3600
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if delta := panel.Gamma*parallax - panel.AxisDegrees; math.Abs(delta) > 1e-4 {
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t.Fatalf("Gamma×parallax - Axis = %g", delta)
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}
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}
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