48 lines
2.0 KiB
Go
48 lines
2.0 KiB
Go
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package eclipse
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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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// 三个 info 都带 provenance：GreatestJDE（力学时）经 TT2UTC 复现民用时刻字段；
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// DeltaTSeconds 是 TT−UT1，不能用来做这次换算（会差一个 DUT1）。
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func TestEclipseInfoCarriesProvenance(t *testing.T) {
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date := time.Date(2024, time.April, 8, 12, 0, 0, 0, time.UTC)
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solar, ok := SolarEclipseOnDate(date)
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if !ok {
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t.Fatal("缺少 2024-04-08 日食")
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}
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if solar.GreatestJDE == 0 || solar.DeltaTSeconds == 0 {
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t.Fatalf("日食 provenance 未填充: JDE=%v ΔT=%v", solar.GreatestJDE, solar.DeltaTSeconds)
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}
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if got := solarEclipseTTJDEToTime(solar.GreatestJDE, solar.GreatestEclipse.Location()); !got.Equal(solar.GreatestEclipse) {
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t.Errorf("GreatestJDE 未经 TT2UTC 复现食甚时刻: %v vs %v", got, solar.GreatestEclipse)
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}
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// DUT1 非零时，用 ΔT 换算出来的 UT1 时刻必须与民用时刻不同：两者的差就是 DUT1。
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ut1 := basic.JD2DateByZone(solar.GreatestJDE-solar.DeltaTSeconds/86400, solar.GreatestEclipse.Location(), false)
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dut1 := (basic.TT2UTC(solar.GreatestJDE)-solar.GreatestJDE)*86400 - solar.DeltaTSeconds
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if math.Abs(dut1) > 1e-3 && ut1.Equal(solar.GreatestEclipse) {
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t.Errorf("民用时刻字段走了 ΔT（TT−UT1）换算: %v vs %v", ut1, solar.GreatestEclipse)
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}
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local := ClosestLocalSolarEclipse(date, -96.8, 32.8, 0)
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if local.GreatestJDE == 0 || local.DeltaTSeconds == 0 {
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t.Fatalf("站心日食 provenance 未填充: JDE=%v ΔT=%v", local.GreatestJDE, local.DeltaTSeconds)
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}
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if got := solarEclipseTTJDEToTime(local.GreatestJDE, local.GreatestEclipse.Location()); !got.Equal(local.GreatestEclipse) {
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t.Errorf("GreatestJDE+ΔT 未复现站心食甚: %v vs %v", got, local.GreatestEclipse)
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}
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lunar, ok := LunarEclipseOnDate(time.Date(2025, time.September, 7, 12, 0, 0, 0, time.UTC))
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if !ok {
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t.Fatal("缺少 2025-09-07 月食")
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}
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if lunar.GreatestJDE == 0 || lunar.DeltaTSeconds == 0 {
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t.Fatalf("月食 provenance 未填充: JDE=%v ΔT=%v", lunar.GreatestJDE, lunar.DeltaTSeconds)
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}
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}
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