46 lines
1.2 KiB
Go
46 lines
1.2 KiB
Go
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package basic
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import (
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"math"
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"testing"
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"time"
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)
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func TestParallacticAngleByHourAngleKnownCases(t *testing.T) {
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cases := []struct {
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name string
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hourAngle float64
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dec float64
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lat float64
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want float64
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}{
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{name: "meridian", hourAngle: 0, dec: 10, lat: 45, want: 0},
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{name: "equator west", hourAngle: 30, dec: 0, lat: 0, want: 90},
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{name: "equator east", hourAngle: -30, dec: 0, lat: 0, want: -90},
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}
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for _, tc := range cases {
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got := ParallacticAngleByHourAngle(tc.hourAngle, tc.dec, tc.lat)
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if math.Abs(got-tc.want) > 1e-12 {
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t.Fatalf("%s mismatch: got %.15f want %.15f", tc.name, got, tc.want)
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}
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}
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}
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func TestStarParallacticAngleMatchesHourAngleForm(t *testing.T) {
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date := time.Date(2026, 4, 29, 21, 15, 0, 0, time.FixedZone("CST", 8*3600))
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jde := Date2JDE(date)
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_, offsetSeconds := date.Zone()
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timezone := float64(offsetSeconds) / 3600.0
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ra := 101.28715533
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dec := -16.71611586
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lon := 115.0
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lat := 40.0
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got := StarParallacticAngle(jde, ra, dec, lon, lat, timezone)
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want := ParallacticAngleByHourAngle(StarHourAngle(jde, ra, lon, timezone), dec, lat)
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if math.Abs(got-want) > 1e-12 {
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t.Fatalf("star parallactic angle mismatch: got %.15f want %.15f", got, want)
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}
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}
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