93 lines
3.2 KiB
Go
93 lines
3.2 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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func TestJupiterCentralMeridiansMeeusExample43A(t *testing.T) {
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got := JupiterCentralMeridians(2448972.50068)
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ds, de := JupiterDSDE(2448972.50068)
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assertPlanetPhaseClose(t, "Jupiter.CMI", got.SystemI, 268.06, 0.02)
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assertPlanetPhaseClose(t, "Jupiter.CMII", got.SystemII, 72.74, 0.02)
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assertPlanetPhaseClose(t, "Jupiter.DS.Exact", ds, -1.733360091891, 1e-9)
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assertPlanetPhaseClose(t, "Jupiter.DE.Exact", de, -2.484625891057, 1e-9)
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}
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func TestJupiterCentralMeridianSystemIIIMatchesHorizonsBaseline(t *testing.T) {
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data, err := os.ReadFile("testdata/planet_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 []planetPhysicalSample
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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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for _, sample := range samples {
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if sample.Body != "jupiter" {
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continue
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}
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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 := JupiterCentralMeridians(jd)
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assertPlanetPhaseClose(t, "Jupiter."+sample.InputUTC+".CMIII", got.SystemIII, sample.SubEarthLongitude, 0.02)
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}
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}
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func TestJupiterCentralMeridiansNFullMatchesDefault(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 := JupiterCentralMeridians(jd)
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gotN := JupiterCentralMeridiansN(jd, -1)
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ds, de := JupiterDSDE(jd)
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dsN, deN := JupiterDSDEN(jd, -1)
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if math.Float64bits(got.SystemI) != math.Float64bits(gotN.SystemI) {
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t.Fatalf("SystemI mismatch: got %.18f want %.18f", got.SystemI, gotN.SystemI)
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}
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if math.Float64bits(got.SystemII) != math.Float64bits(gotN.SystemII) {
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t.Fatalf("SystemII mismatch: got %.18f want %.18f", got.SystemII, gotN.SystemII)
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}
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if math.Float64bits(got.SystemIII) != math.Float64bits(gotN.SystemIII) {
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t.Fatalf("SystemIII mismatch: got %.18f want %.18f", got.SystemIII, gotN.SystemIII)
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}
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if math.Float64bits(ds) != math.Float64bits(dsN) {
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t.Fatalf("DS mismatch: got %.18f want %.18f", ds, dsN)
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}
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if math.Float64bits(de) != math.Float64bits(deN) {
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t.Fatalf("DE mismatch: got %.18f want %.18f", de, deN)
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}
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}
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func TestJupiterCentralMeridianAndDSDESampleSweepFiniteAndInRange(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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meridians := JupiterCentralMeridians(jd)
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ds, de := JupiterDSDE(jd)
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physical := JupiterPhysical(jd)
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prefix := date.Format(time.RFC3339)
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assertFiniteRange(t, prefix+".SystemI", meridians.SystemI, 0, 360, true)
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assertFiniteRange(t, prefix+".SystemII", meridians.SystemII, 0, 360, true)
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assertFiniteRange(t, prefix+".SystemIII", meridians.SystemIII, 0, 360, true)
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assertFiniteRange(t, prefix+".DS", ds, -90, 90, false)
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assertFiniteRange(t, prefix+".DE", de, -90, 90, false)
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assertSameFloat(t, prefix+".CMIII", meridians.SystemIII, physical.SubEarthLongitude)
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}
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}
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