22 lines
656 B
Go
22 lines
656 B
Go
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package formula
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import (
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"math"
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"testing"
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)
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func TestRefractionRoundTrip(t *testing.T) {
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for _, alt := range []float64{-1, 0, 0.5, 5, 30, 80} {
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apparent := ApparentAltitude(alt, RefractionStandardPressureHPa, RefractionStandardTemperatureC)
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if back := TrueAltitude(apparent, RefractionStandardPressureHPa, RefractionStandardTemperatureC); math.Abs(back-alt) > 1e-9 {
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t.Errorf("alt %v: round trip %v", alt, back)
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}
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}
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if r := RefractionFromTrueAltitude(0, 1010, 10) * 60; r < 28 || r > 36 {
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t.Errorf("horizon refraction %.2f arcmin", r)
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}
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if !math.IsNaN(RefractionFromTrueAltitude(0, 0, 10)) {
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t.Error("zero pressure must be NaN")
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}
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}
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