46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
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package spk
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import (
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"math"
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"os"
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"testing"
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"b612.me/astro/internal/ephem"
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"b612.me/astro/planet/internal/semianalytic"
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)
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// SPK 只给几何状态，实例应走通用矢量视位置链；与按 DE441 拟合的内置表相比只剩表的拟合误差。
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func TestSPKInstanceApparentMatchesSemianalytic(t *testing.T) {
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path := de441Path()
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if _, err := os.Stat(path); err != nil {
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t.Skip("DE441 file not available; set ASTRO_DE441_BSP")
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}
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file, err := Open(path)
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if err != nil {
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t.Fatal(err)
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}
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defer file.Close()
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inst := ephem.NewInstance(file)
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worst := 0.0
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for _, jd := range []float64{2451545.0, 2460409.25, 2470000.5} {
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for _, b := range []ephem.Body{ephem.Sun, ephem.Moon, ephem.Mercury, ephem.Venus, ephem.Mars, ephem.Jupiter, ephem.Saturn, ephem.Uranus, ephem.Neptune} {
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got, gd, _, err := inst.Apparent(b, jd)
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if err != nil {
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t.Fatalf("jd %.1f body %d: %v", jd, b, err)
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}
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want, wd, _, err := semianalytic.Ephemeris{}.Apparent(b, jd)
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if err != nil {
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t.Fatal(err)
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}
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c := got[0]*want[0] + got[1]*want[1] + got[2]*want[2]
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arcsec := math.Acos(math.Min(1, c)) * 206264.806
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worst = math.Max(worst, arcsec)
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// 内置表的几何距离取自快速档，外行星可差数万千米。
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if arcsec > 1.5 || math.Abs(gd-wd)/wd > 5e-5 {
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t.Errorf("jd %.1f body %d: %.4f\" dist rel %.2e", jd, b, arcsec, (gd-wd)/wd)
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}
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}
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}
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t.Logf("worst %.4f\"", worst)
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}
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