98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
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package jupiter
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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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const galileanHorizonsToleranceArcsec = 1.0
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type galileanHorizonsEquatorialRecord struct {
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RA float64 `json:"ra_deg"`
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Dec float64 `json:"dec_deg"`
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Delta float64 `json:"delta_au"`
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}
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type galileanHorizonsOffsetRecord struct {
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RA float64 `json:"ra_deg"`
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Dec float64 `json:"dec_deg"`
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Delta float64 `json:"delta_au"`
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OffsetXArcsec float64 `json:"offset_x_arcsec"`
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OffsetYArcsec float64 `json:"offset_y_arcsec"`
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}
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type galileanHorizonsSample struct {
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UTC string `json:"utc"`
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Jupiter galileanHorizonsEquatorialRecord `json:"jupiter"`
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Satellites map[string]galileanHorizonsOffsetRecord `json:"satellites"`
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}
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func TestGalileanSatellitesAgainstHorizonsRelativeOffsets(t *testing.T) {
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samples := loadGalileanHorizonsBaseline(t)
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maxXDiff := 0.0
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maxYDiff := 0.0
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for _, sample := range samples {
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date, err := time.Parse(time.RFC3339, sample.UTC)
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if err != nil {
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t.Fatalf("parse %s: %v", sample.UTC, err)
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}
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got := Satellites(date)
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for name, want := range sample.Satellites {
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position := selectGalileanSatellite(got, name)
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xDiff := math.Abs(position.OffsetXArcsec - want.OffsetXArcsec)
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yDiff := math.Abs(position.OffsetYArcsec - want.OffsetYArcsec)
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if xDiff > maxXDiff {
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maxXDiff = xDiff
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}
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if yDiff > maxYDiff {
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maxYDiff = yDiff
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}
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if xDiff > galileanHorizonsToleranceArcsec {
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t.Fatalf("%s X mismatch at %s: got %.6f want %.6f", name, sample.UTC, position.OffsetXArcsec, want.OffsetXArcsec)
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}
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if yDiff > galileanHorizonsToleranceArcsec {
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t.Fatalf("%s Y mismatch at %s: got %.6f want %.6f", name, sample.UTC, position.OffsetYArcsec, want.OffsetYArcsec)
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}
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wantFront := want.Delta < sample.Jupiter.Delta
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if position.InFrontOfJupiter != wantFront {
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t.Fatalf("%s front/back mismatch at %s: got %v want %v", name, sample.UTC, position.InFrontOfJupiter, wantFront)
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}
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}
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}
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t.Logf("galilean Horizons max diff: X=%.3f arcsec Y=%.3f arcsec", maxXDiff, maxYDiff)
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}
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func loadGalileanHorizonsBaseline(t *testing.T) []galileanHorizonsSample {
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t.Helper()
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data, err := os.ReadFile("testdata/galilean_satellites_horizons.json")
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if err != nil {
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t.Fatal(err)
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}
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var samples []galileanHorizonsSample
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if err := json.Unmarshal(data, &samples); err != nil {
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t.Fatal(err)
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}
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if len(samples) == 0 {
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t.Fatal("empty Galilean baseline")
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}
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return samples
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}
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func selectGalileanSatellite(info GalileanSatellitesInfo, name string) GalileanSatellitePosition {
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switch name {
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case "io":
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return info.Io
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case "europa":
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return info.Europa
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case "ganymede":
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return info.Ganymede
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case "callisto":
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return info.Callisto
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default:
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panic("unknown satellite: " + name)
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}
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}
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