22 lines
505 B
Go
22 lines
505 B
Go
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package moon
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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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date := time.Date(2026, 4, 29, 21, 15, 0, 0, time.FixedZone("CST", 8*3600))
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lon := 116.391
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lat := 39.907
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got := ParallacticAngle(date, lon, lat)
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want := basic.ParallacticAngleByHourAngle(HourAngle(date, lon, lat), ApparentDec(date, lon, lat), lat)
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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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