72 lines
2.7 KiB
Go
72 lines
2.7 KiB
Go
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package eclipse
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import (
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"testing"
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"time"
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)
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// 把某个时间窗内落入指定沙罗系列的月食枚举出来。
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func lunarSarosMembersInWindow(t *testing.T, series int, start, end time.Time) []time.Time {
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t.Helper()
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seen := map[int64]bool{}
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members := make([]time.Time, 0, 4)
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for cursor := start; cursor.Before(end); cursor = cursor.AddDate(0, 1, 0) {
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info := ClosestLunarEclipse(cursor)
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if info.Maximum.IsZero() || info.Saros.Series != series {
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continue
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}
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key := info.Maximum.UTC().Unix()
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if seen[key] {
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continue
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}
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seen[key] = true
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members = append(members, info.Maximum)
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}
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return members
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}
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// 月食沙罗系列的总成员数与成员序号必须与 NASA 目录一致。
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// 123 号 72 次（NASA LEsaros123：24N 6P 25T 8P 9N = 72），157 号 73 次；
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// 2025-03-14 是 123 号的第 53 个成员。
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func TestLunarSarosSeriesMemberCounts(t *testing.T) {
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for _, test := range []struct {
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name string
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probe time.Time
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series int
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member int
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count int
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}{
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{name: "123-2025", probe: time.Date(2025, time.March, 14, 0, 0, 0, 0, time.UTC), series: 123, member: 53, count: 72},
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{name: "157-2360", probe: time.Date(2360, time.April, 2, 0, 0, 0, 0, time.UTC), series: 157, member: 4, count: 73},
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} {
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info := ClosestLunarEclipse(test.probe)
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if info.Saros.Series != test.series || info.Saros.Member != test.member || info.Saros.Count != test.count {
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t.Fatalf("%s: series %d member %d/%d, want %d member %d/%d",
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test.name, info.Saros.Series, info.Saros.Member, info.Saros.Count,
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test.series, test.member, test.count)
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}
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}
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}
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// 123 号系列的边界必须与 NASA 目录一致：首 1087-08-16、末 2367-10-08，两端之外再无成员。
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func TestLunarSarosSeries123Boundaries(t *testing.T) {
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// 系列开始前的三年窗口里不应有任何 123 号成员。
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if members := lunarSarosMembersInWindow(t, 123,
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time.Date(1084, time.January, 1, 0, 0, 0, 0, time.UTC),
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time.Date(1087, time.January, 1, 0, 0, 0, 0, time.UTC)); len(members) != 0 {
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t.Fatalf("series 123 starts before 1087: %v", members)
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}
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if members := lunarSarosMembersInWindow(t, 123,
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time.Date(1087, time.January, 1, 0, 0, 0, 0, time.UTC),
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time.Date(1090, time.January, 1, 0, 0, 0, 0, time.UTC)); len(members) != 1 ||
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members[0].UTC().Format("2006-01-02") != "1087-08-16" {
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t.Fatalf("series 123 first members = %v, want one on 1087-08-16", members)
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}
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if members := lunarSarosMembersInWindow(t, 123,
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time.Date(2367, time.January, 1, 0, 0, 0, 0, time.UTC),
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time.Date(2371, time.January, 1, 0, 0, 0, 0, time.UTC)); len(members) != 1 ||
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members[0].UTC().Format("2006-01-02") != "2367-10-08" {
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t.Fatalf("series 123 last members = %v, want one on 2367-10-08", members)
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}
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}
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