55 lines
2.0 KiB
Go
55 lines
2.0 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 TestVenusIlluminatedFractionMeeusExample(t *testing.T) {
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jd := Date2JDE(time.Date(1992, 12, 20, 0, 0, 0, 0, time.UTC))
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assertPlanetPhaseClose(t, "VenusPhaseAngle", VenusPhaseAngle(jd), 72.96, 0.01)
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assertPlanetPhaseClose(t, "VenusIlluminatedFraction", VenusIlluminatedFraction(jd), 0.647, 0.001)
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}
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func TestPlanetIlluminatedFractionRanges(t *testing.T) {
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jd := TD2UT(Date2JDE(time.Date(2026, 4, 26, 9, 30, 45, 0, time.UTC)), true)
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cases := []struct {
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name string
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phaseAngle func(float64) float64
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fraction func(float64) float64
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positionAngle func(float64) float64
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}{
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{"Mercury", MercuryPhaseAngle, MercuryIlluminatedFraction, MercuryBrightLimbPositionAngle},
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{"Venus", VenusPhaseAngle, VenusIlluminatedFraction, VenusBrightLimbPositionAngle},
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{"Mars", MarsPhaseAngle, MarsIlluminatedFraction, MarsBrightLimbPositionAngle},
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{"Jupiter", JupiterPhaseAngle, JupiterIlluminatedFraction, JupiterBrightLimbPositionAngle},
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{"Saturn", SaturnPhaseAngle, SaturnIlluminatedFraction, SaturnBrightLimbPositionAngle},
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{"Uranus", UranusPhaseAngle, UranusIlluminatedFraction, UranusBrightLimbPositionAngle},
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{"Neptune", NeptunePhaseAngle, NeptuneIlluminatedFraction, NeptuneBrightLimbPositionAngle},
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}
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for _, tc := range cases {
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phaseAngle := tc.phaseAngle(jd)
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if phaseAngle < 0 || phaseAngle > 180 {
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t.Fatalf("%s phase angle out of range: %.12f", tc.name, phaseAngle)
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}
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fraction := tc.fraction(jd)
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if fraction < 0 || fraction > 1 {
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t.Fatalf("%s illuminated fraction out of range: %.12f", tc.name, fraction)
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}
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positionAngle := tc.positionAngle(jd)
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if positionAngle < 0 || positionAngle >= 360 {
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t.Fatalf("%s bright limb position angle out of range: %.12f", tc.name, positionAngle)
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}
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}
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}
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func assertPlanetPhaseClose(t *testing.T, name string, got, want, tolerance float64) {
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t.Helper()
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if math.Abs(got-want) > tolerance {
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t.Fatalf("%s mismatch: got %.12f want %.12f tolerance %.12f", name, got, want, tolerance)
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}
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}
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