45 lines
1.5 KiB
Go
45 lines
1.5 KiB
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 TestTIOLocator(t *testing.T) {
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// 2002-09-29 0h TT（MJD 52541）：s′ = −6.216698469981019e-12 rad。
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got := TIOLocatorArcsec(2452541.5) * arcsecToRadian
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assertFormulaClose(t, "TIOLocator", got, -0.6216698469981019309e-11, 1e-24)
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if !math.IsNaN(TIOLocatorArcsec(math.NaN())) {
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t.Fatal("expected NaN")
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}
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}
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func TestPolarMotionMatrix(t *testing.T) {
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const r2as = 1 / arcsecToRadian
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w := PolarMotionMatrix(2.55060238e-7*r2as, 1.860359247e-6*r2as, -0.1367174580728891460e-10*r2as)
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want := [3][3]float64{
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{0.9999999999999674721, -0.1367174580728846989e-10, 0.2550602379999972345e-6},
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{0.1414624947957029801e-10, 0.9999999999982695317, -0.1860359246998866389e-5},
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{-0.2550602379741215021e-6, 0.1860359247002414021e-5, 0.9999999999982370039},
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}
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for i := range want {
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for j := range want[i] {
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assertFormulaClose(t, "PolarMotionMatrix", w[i][j], want[i][j], 1e-16)
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}
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}
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}
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func TestCelestialPoleOffsetMatrix(t *testing.T) {
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// 改正后的极方向必须被映射到 z 轴：Δ·(dX, dY, 1) ≈ (0, 0, 1)。
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d := CelestialPoleOffsetMatrix(0.3, -0.2)
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x, y := 0.3*arcsecToRadian/1000, -0.2*arcsecToRadian/1000
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p := [3]float64{x, y, 1}
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for i, want := range [3]float64{0, 0, 1} {
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got := d[i][0]*p[0] + d[i][1]*p[1] + d[i][2]*p[2]
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assertFormulaClose(t, "CelestialPoleOffsetMatrix", got, want, 1e-20)
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}
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if !math.IsNaN(CelestialPoleOffsetMatrix(math.Inf(1), 0)[0][0]) {
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t.Fatal("expected NaN matrix")
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}
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}
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