26 lines
722 B
Go
26 lines
722 B
Go
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package orbit
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import (
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"math"
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"testing"
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"time"
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"b612.me/astro/basic"
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)
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func TestParallacticAngleMatchesHourAngleForm(t *testing.T) {
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elements := sampleObservationElements()
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date := time.Date(2025, 11, 21, 20, 0, 0, 0, time.FixedZone("CST", 8*3600))
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got := ParallacticAngle(date, elements, shanghaiLon, shanghaiLat, shanghaiHeightMeters)
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position := ApparentTopocentricEquatorial(date, elements, shanghaiLon, shanghaiLat, shanghaiHeightMeters)
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want := basic.ParallacticAngleByHourAngle(
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HourAngle(date, elements, shanghaiLon, shanghaiLat, shanghaiHeightMeters),
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position.Dec,
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shanghaiLat,
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)
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if math.Abs(got-want) > 1e-12 {
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t.Fatalf("parallactic angle mismatch: got %.15f want %.15f", got, want)
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}
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}
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