101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
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package basic
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import (
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"encoding/json"
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"math"
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"os"
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"testing"
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"time"
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)
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type sunPhysicalSample struct {
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InputUTC string `json:"input_utc"`
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P float64 `json:"p"`
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B0 float64 `json:"b0"`
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L0 float64 `json:"l0"`
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}
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func TestSunPhysicalMatchesHorizonsBaseline(t *testing.T) {
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// Baseline is generated from JPL Horizons by scripts/generate_sun_physical_baseline.sh.
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data, err := os.ReadFile("testdata/sun_physical_baseline.json")
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if err != nil {
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t.Fatalf("read baseline: %v", err)
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}
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var samples []sunPhysicalSample
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if err := json.Unmarshal(data, &samples); err != nil {
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t.Fatalf("decode baseline: %v", err)
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}
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var maxPDiff float64
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var maxB0Diff float64
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var maxL0Diff float64
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for _, sample := range samples {
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date, err := time.Parse(time.RFC3339, sample.InputUTC)
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if err != nil {
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t.Fatalf("parse sample time %q: %v", sample.InputUTC, err)
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}
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jd := TD2UT(Date2JDE(date.UTC()), true)
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got := SunPhysical(jd)
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pDiff := angleDiffAbs(got.P, sample.P)
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if pDiff > maxPDiff {
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maxPDiff = pDiff
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}
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b0Diff := math.Abs(got.B0 - sample.B0)
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if b0Diff > maxB0Diff {
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maxB0Diff = b0Diff
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}
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l0Diff := angleDiffAbs(got.L0, sample.L0)
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if l0Diff > maxL0Diff {
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maxL0Diff = l0Diff
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}
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assertPlanetPhaseClose(t, sample.InputUTC+".P", got.P, sample.P, 0.01)
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assertPlanetPhaseClose(t, sample.InputUTC+".B0", got.B0, sample.B0, 0.01)
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assertPlanetPhaseClose(t, sample.InputUTC+".L0", got.L0, sample.L0, 0.05)
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}
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t.Logf("sun physical max diff: P=%.6fdeg B0=%.6fdeg L0=%.6fdeg", maxPDiff, maxB0Diff, maxL0Diff)
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}
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func TestSunPhysicalNFullMatchesDefault(t *testing.T) {
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jd := TD2UT(Date2JDE(time.Date(2026, 4, 28, 9, 30, 45, 0, time.UTC)), true)
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got := SunPhysical(jd)
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gotN := SunPhysicalN(jd, -1)
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if math.Float64bits(got.P) != math.Float64bits(gotN.P) ||
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math.Float64bits(got.B0) != math.Float64bits(gotN.B0) ||
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math.Float64bits(got.L0) != math.Float64bits(gotN.L0) {
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t.Fatalf("SunPhysical full-n mismatch: got %+v want %+v", got, gotN)
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}
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}
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func TestSunPhysicalSampleSweepFiniteAndInRange(t *testing.T) {
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dates := []time.Time{
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time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC),
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time.Date(1969, 7, 20, 20, 17, 40, 0, time.UTC),
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time.Date(2000, 1, 1, 12, 0, 0, 0, time.UTC),
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time.Date(2026, 4, 28, 9, 30, 45, 0, time.UTC),
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time.Date(2099, 12, 31, 23, 59, 59, 0, time.UTC),
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}
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for _, date := range dates {
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jd := TD2UT(Date2JDE(date.UTC()), true)
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got := SunPhysical(jd)
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prefix := date.Format(time.RFC3339)
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assertFiniteRange(t, prefix+".P", got.P, 0, 360, true)
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assertFiniteRange(t, prefix+".B0", got.B0, -90, 90, false)
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assertFiniteRange(t, prefix+".L0", got.L0, 0, 360, true)
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}
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}
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func angleDiffAbs(got, want float64) float64 {
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diff := math.Abs(got - want)
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if diff > 180 {
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diff = 360 - diff
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}
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return diff
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}
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