78 lines
2.6 KiB
Go
78 lines
2.6 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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)
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func TestOrbitalNodesDescendingOpposesAscending(t *testing.T) {
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jde := 2461157.5
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testCases := []struct {
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name string
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ascending func(float64) float64
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descending func(float64) float64
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}{
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{name: "moon", ascending: MoonAscendingNode, descending: MoonDescendingNode},
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{name: "mercury", ascending: MercuryAscendingNode, descending: MercuryDescendingNode},
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{name: "venus", ascending: VenusAscendingNode, descending: VenusDescendingNode},
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{name: "mars", ascending: MarsAscendingNode, descending: MarsDescendingNode},
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{name: "jupiter", ascending: JupiterAscendingNode, descending: JupiterDescendingNode},
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{name: "saturn", ascending: SaturnAscendingNode, descending: SaturnDescendingNode},
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{name: "uranus", ascending: UranusAscendingNode, descending: UranusDescendingNode},
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{name: "neptune", ascending: NeptuneAscendingNode, descending: NeptuneDescendingNode},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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ascending := tc.ascending(jde)
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descending := tc.descending(jde)
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want := ascending + 180
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if want >= 360 {
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want -= 360
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}
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if diff := angularDifference(descending, ascending+180); diff > 1e-10 {
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t.Fatalf("descending node mismatch: got %.12f want %.12f diff=%.12g", descending, want, diff)
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}
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})
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}
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}
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func TestOrbitalNodesNFullMatchesDefault(t *testing.T) {
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jde := 2461157.5
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testCases := []struct {
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name string
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defaultFn func(float64) float64
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truncatedN func(float64, int) float64
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}{
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{name: "moon", defaultFn: MoonAscendingNode, truncatedN: MoonAscendingNodeN},
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{name: "mercury", defaultFn: MercuryAscendingNode, truncatedN: MercuryAscendingNodeN},
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{name: "venus", defaultFn: VenusAscendingNode, truncatedN: VenusAscendingNodeN},
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{name: "mars", defaultFn: MarsAscendingNode, truncatedN: MarsAscendingNodeN},
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{name: "jupiter", defaultFn: JupiterAscendingNode, truncatedN: JupiterAscendingNodeN},
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{name: "saturn", defaultFn: SaturnAscendingNode, truncatedN: SaturnAscendingNodeN},
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{name: "uranus", defaultFn: UranusAscendingNode, truncatedN: UranusAscendingNodeN},
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{name: "neptune", defaultFn: NeptuneAscendingNode, truncatedN: NeptuneAscendingNodeN},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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got := tc.defaultFn(jde)
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gotN := tc.truncatedN(jde, -1)
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if diff := angularDifference(got, gotN); diff > 1e-10 {
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t.Fatalf("full-series N mismatch: got %.12f want %.12f diff=%.12g", gotN, got, diff)
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}
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})
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}
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}
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func angularDifference(a, b float64) float64 {
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diff := math.Mod(a-b, 360)
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if diff < -180 {
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diff += 360
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}
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if diff > 180 {
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diff -= 360
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}
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return math.Abs(diff)
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}
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