65 lines
2.2 KiB
Go
65 lines
2.2 KiB
Go
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package basic
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import (
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"encoding/json"
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"os"
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"testing"
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"time"
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)
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type moonGeocentricApparentSample struct {
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InputUTC string `json:"input_utc"`
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RightAscension float64 `json:"right_ascension"`
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Declination float64 `json:"declination"`
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EclipticLongitude float64 `json:"ecliptic_longitude"`
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EclipticLatitude float64 `json:"ecliptic_latitude"`
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}
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func TestMoonGeocentricApparentCoordinatesMatchHorizonsBaseline(t *testing.T) {
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data, err := os.ReadFile("testdata/moon_geocentric_apparent_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 []moonGeocentricApparentSample
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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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if len(samples) == 0 {
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t.Fatal("empty moon apparent baseline")
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}
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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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prefix := "moon." + sample.InputUTC
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assertPlanetApparentAngleClose(t, prefix+".RightAscension", HMoonGeocentricApparentRa(jd), sample.RightAscension, 0.001)
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assertPlanetPhaseClose(t, prefix+".Declination", HMoonGeocentricApparentDec(jd), sample.Declination, 0.001)
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assertPlanetApparentAngleClose(t, prefix+".EclipticLongitude", HMoonApparentLo(jd), sample.EclipticLongitude, 0.001)
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assertPlanetPhaseClose(t, prefix+".EclipticLatitude", HMoonTrueBo(jd), sample.EclipticLatitude, 0.001)
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}
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}
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func TestMoonGeocentricTrueCoordinatesFollowDefinition(t *testing.T) {
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samples := []time.Time{
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time.Date(1900, 1, 14, 12, 0, 0, 0, time.UTC),
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time.Date(1950, 6, 3, 0, 0, 0, 0, time.UTC),
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time.Date(2000, 2, 29, 18, 0, 0, 0, time.UTC),
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time.Date(2026, 1, 1, 6, 0, 0, 0, time.UTC),
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time.Date(2100, 8, 17, 9, 0, 0, 0, time.UTC),
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}
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for _, sample := range samples {
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jd := TD2UT(Date2JDE(sample.UTC()), true)
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wantRA, wantDec := LoBoToRaDec(jd, HMoonTrueLo(jd), HMoonTrueBo(jd))
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gotRA, gotDec := HMoonGeocentricTrueRaDec(jd)
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assertPlanetApparentAngleClose(t, sample.Format(time.RFC3339)+".TrueRightAscension", gotRA, wantRA, 1e-12)
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assertPlanetPhaseClose(t, sample.Format(time.RFC3339)+".TrueDeclination", gotDec, wantDec, 1e-12)
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}
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}
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