b612
2bf8478639
- 新增日月食中心带、偏食带、阴影足迹、等时线、食分线及升落边界计算，支持极区与混合食拓扑 - 新增日食单时刻阴影求解器、站心状态查询、批量采样和 ΔT 覆盖接口 - 重构恒星与行星月掩路径，补充有限盘面接触、站心修正、掩带宽度、极区投影及升落边界 - 扩展 SVG 与 GeoJSON 输出，支持详细面板、全球/极区/地球投影、边界闭合、时间标记和拓扑签名 - 扩展日月食候选搜索、局地搜索、沙罗序列预计算与范围外推，补充系列锚点和成员一致性校验 - 补齐古历纪年、儒略历独有闰日、多公历候选、历法改革跨日及精确日期运算接口 - 优化 ΔT、章动、恒星时、月球地平线、事件根搜索和本地星历缓存，降低重复计算开销并提升边界稳定
102 lines
3.4 KiB
Go
102 lines
3.4 KiB
Go
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 TestDefaultDeltaTFractionalYear(t *testing.T) {
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for _, year := range []float64{-700.5, -0.5, 0, 1000.5, 1582.75, 1800.5, 2000.5, 2026.5} {
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whole := math.Floor(year)
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start := JDECalc(int(whole), 1, 1)
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end := JDECalc(int(whole)+1, 1, 1)
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want := DefaultDeltaTv2(start+(year-whole)*(end-start), true)
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got := DefaultDeltaTv2(year, false)
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if math.IsNaN(got) || math.Abs(got-want) > 1e-10 {
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t.Errorf("year=%v DeltaT=%v, want %v", year, got, want)
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}
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}
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}
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func TestDefaultDeltaTInvalidInput(t *testing.T) {
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for _, value := range []float64{math.NaN(), math.Inf(1), math.Inf(-1)} {
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for _, isJD := range []bool{false, true} {
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if got := DefaultDeltaTv2(value, isJD); !math.IsNaN(got) {
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t.Errorf("DeltaT(%v, %v)=%v, want NaN", value, isJD, got)
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}
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}
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}
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}
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func TestDeltaTLeapSecondBoundary(t *testing.T) {
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boundary := 2457754.5
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if got := DeltaTv2(boundary); got != 69.184 {
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t.Fatalf("DeltaT at leap-second boundary=%v, want 69.184", got)
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}
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if got := DeltaTSplineY(math.NaN()); !math.IsNaN(got) {
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t.Fatalf("DeltaTSplineY(NaN)=%v, want NaN", got)
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}
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}
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func TestTD2UTRoundTrip(t *testing.T) {
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for _, year := range []int{-2000, -720, 0, 26, 1426, 2025, 2027, 3627, 4026, 5000} {
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ut := JDECalc(year, 9, 20.123456)
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tt := TD2UT(ut, true)
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if got := TD2UT(tt, false); math.Abs(got-ut) > math.Nextafter(ut, math.Inf(1))-ut {
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t.Errorf("year=%d UT round trip differs by %.9f seconds", year, (got-ut)*86400)
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}
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if got := TD2UT(TD2UT(tt, false), true); got != tt {
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t.Errorf("year=%d TT round trip differs by %.9f seconds", year, (got-tt)*86400)
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}
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}
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for _, seconds := range []float64{-70, -1, -0.1, 0, 0.1, 1, 70} {
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ut := 2457754.5 + seconds/86400
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if got := TD2UT(TD2UT(ut, true), false); got != ut {
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t.Errorf("leap second offset=%g round trip differs by %.9f seconds", seconds, (got-ut)*86400)
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}
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}
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}
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func TestTD2UTCustomDeltaT(t *testing.T) {
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original := GetDeltaTFn()
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t.Cleanup(func() { SetDeltaTFn(original) })
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for _, slope := range []float64{0, 0.01} {
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SetDeltaTFn(func(jd float64, isJD bool) float64 {
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if !isJD {
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t.Fatal("conversion must request Delta T at a Julian day")
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}
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return 10000 + slope*(jd-2451545)
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})
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ut := 3000000.123456
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if got := TD2UT(TD2UT(ut, true), false); got != ut {
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t.Errorf("custom slope=%g round trip differs by %.9f seconds", slope, (got-ut)*86400)
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}
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}
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}
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// DeltaTSecondsAt：有限值（含 0）是显式覆盖，NaN/±Inf 才回退进程级模型；模型按 UT 求值。
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func TestDeltaTSecondsAtOverrideContract(t *testing.T) {
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jd := 2460310.5
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if got := DeltaTSecondsAt(jd, 0); got != 0 {
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t.Fatalf("explicit zero override = %v, want 0", got)
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}
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if got := DeltaTSecondsAt(jd, 12.5); got != 12.5 {
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t.Fatalf("explicit override = %v, want 12.5", got)
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}
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model := DeltaTSecondsAt(jd, math.NaN())
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if !finite(model) || model <= 0 {
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t.Fatalf("model fallback = %v, want a positive finite value", model)
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}
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if got := DeltaTSecondsAt(jd, math.Inf(1)); got != model {
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t.Fatalf("+Inf override = %v, want the model %v", got, model)
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}
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if got := deltaTModelSecondsAtTT(jd); got != model {
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t.Fatalf("deltaTModelSecondsAtTT = %v, want %v", got, model)
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}
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// 模型按 UT 键控：与"把 TT 直接当 UT"的朴素求值有微小差别。
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naive := DeltaT(jd, true)
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if diff := math.Abs(naive - model); diff > 1e-3 {
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t.Fatalf("UT-keyed model differs from naive TT evaluation by %v s", diff)
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}
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}
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