feat: 完善日月食与月掩几何链路并扩展历法接口
- 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
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@@ -0,0 +1,3 @@
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// Package moon 轻量月球链路：少量摄动项的月球近似、轻量站心修正、月相月龄和升落搜索，角度单位为度。
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// Package moon is the lightweight lunar chain: a few-perturbation-term Moon approximation, light topocentric correction, phase, age and rise/set search; angles are degrees.
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package moon
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+11
-4
@@ -60,27 +60,34 @@ func ApparentRaDec(date time.Time, lon, lat float64) (float64, float64) {
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return state.RightAscension, state.Declination
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}
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func topocentricHorizontal(date time.Time, lon, lat float64) (altitude, azimuth, hourAngle float64) {
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jd := basic.Date2JDE(date.UTC())
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state := lite.MoonTopocentric(jd, lon, lat, 0)
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return lite.HorizontalCoordinates(state.RightAscension, state.Declination, jd, lon, lat)
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}
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// HourAngle 轻量时角 / lightweight hour angle.
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func HourAngle(date time.Time, lon, lat float64) float64 {
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_, _, hourAngle := lite.HorizontalCoordinates(ApparentRa(date, lon, lat), ApparentDec(date, lon, lat), basic.Date2JDE(date.UTC()), lon, lat)
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_, _, hourAngle := topocentricHorizontal(date, lon, lat)
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return hourAngle
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}
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// Azimuth 轻量方位角 / lightweight azimuth.
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func Azimuth(date time.Time, lon, lat float64) float64 {
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_, azimuth, _ := lite.HorizontalCoordinates(ApparentRa(date, lon, lat), ApparentDec(date, lon, lat), basic.Date2JDE(date.UTC()), lon, lat)
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_, azimuth, _ := topocentricHorizontal(date, lon, lat)
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return azimuth
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}
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// Altitude 轻量高度角 / lightweight altitude.
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func Altitude(date time.Time, lon, lat float64) float64 {
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altitude, _, _ := lite.HorizontalCoordinates(ApparentRa(date, lon, lat), ApparentDec(date, lon, lat), basic.Date2JDE(date.UTC()), lon, lat)
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altitude, _, _ := topocentricHorizontal(date, lon, lat)
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return altitude
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}
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// Zenith 轻量天顶距 / lightweight zenith distance.
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func Zenith(date time.Time, lon, lat float64) float64 {
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return 90 - Altitude(date, lon, lat)
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altitude, _, _ := topocentricHorizontal(date, lon, lat)
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return 90 - altitude
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}
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// SunMoonLoDiff 轻量日月黄经差 / lightweight Moon-Sun ecliptic-longitude difference.
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@@ -2,9 +2,12 @@ package moon
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import (
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"math"
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"math/rand"
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"testing"
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"time"
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"b612.me/astro/basic"
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lite "b612.me/astro/lite/internal"
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fullmoon "b612.me/astro/moon"
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)
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@@ -92,3 +95,83 @@ func assertTimeWithinMinutes(t *testing.T, name string, got, want time.Time, lim
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t.Fatalf("%s = %s, want %s", name, got, want)
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}
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}
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// 四个地平入口须只求一次站心位置：参考实现按旧口径对同一时刻重复求值，逐位对照。
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func TestHorizontalEntriesMatchDuplicatedEvaluation(t *testing.T) {
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type site struct {
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name string
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lon, lat float64
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}
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sites := []site{
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{"shanghai", 121.4737, 31.2304},
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{"sydney", 151.2093, -33.8688},
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{"north-pole", 0, 89.9999},
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{"south-pole", 0, -89.9999},
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{"dateline-west", -179.99, 12},
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{"dateline-east", 179.99, -12},
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{"equator", 0, 0},
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}
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zones := []*time.Location{
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time.UTC,
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time.FixedZone("CST", 8*3600),
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time.FixedZone("EST", -5*3600),
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time.FixedZone("LMT", -7*3600-52*60-58),
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}
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years := []int{-500, 1000, 1582, 2025, 2100, 3000, 4000}
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hours := []int{0, 5, 12, 20, 23}
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type sample struct {
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label string
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date time.Time
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lon float64
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lat float64
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}
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samples := make([]sample, 0, len(sites)*len(zones)*len(years)*len(hours)+200)
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for _, st := range sites {
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for _, zone := range zones {
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for _, year := range years {
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for _, hour := range hours {
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samples = append(samples, sample{
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label: st.name + "/" + zone.String(),
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date: time.Date(year, 3, 17, hour, 43, 21, 123456789, zone),
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lon: st.lon,
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lat: st.lat,
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})
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}
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}
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}
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}
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rng := rand.New(rand.NewSource(20260915))
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for i := 0; i < 200; i++ {
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zone := time.FixedZone("random", (rng.Intn(97)-48)*1800)
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samples = append(samples, sample{
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label: "random",
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date: time.Date(
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rng.Intn(8000)-2000, time.Month(1+rng.Intn(12)), 1+rng.Intn(28),
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rng.Intn(24), rng.Intn(60), rng.Intn(60), rng.Intn(1000000000), zone,
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),
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lon: rng.Float64()*360 - 180,
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lat: rng.Float64()*179.8 - 89.9,
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})
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}
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for _, s := range samples {
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jd := basic.Date2JDE(s.date.UTC())
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altitude, azimuth, hourAngle := lite.HorizontalCoordinates(ApparentRa(s.date, s.lon, s.lat), ApparentDec(s.date, s.lon, s.lat), jd, s.lon, s.lat)
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checks := []struct {
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name string
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got float64
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want float64
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}{
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{"HourAngle", HourAngle(s.date, s.lon, s.lat), hourAngle},
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{"Azimuth", Azimuth(s.date, s.lon, s.lat), azimuth},
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{"Altitude", Altitude(s.date, s.lon, s.lat), altitude},
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{"Zenith", Zenith(s.date, s.lon, s.lat), 90 - altitude},
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}
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for _, check := range checks {
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if check.got != check.want {
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t.Fatalf("%s %s %s: got %.17g want %.17g", check.name, s.label, s.date.Format(time.RFC3339Nano), check.got, check.want)
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}
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}
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}
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}
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@@ -0,0 +1,84 @@
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package moon
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import (
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"testing"
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"time"
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"b612.me/astro/basic"
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lite "b612.me/astro/lite/internal"
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)
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var benchmarkHorizontalSink float64
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func benchmarkHorizontalInputs() (time.Time, float64, float64) {
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return time.Date(2026, 1, 1, 0, 0, 0, 0, time.FixedZone("CST", 8*3600)), 121.4737, 31.2304
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}
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func BenchmarkMoonHourAngle(b *testing.B) {
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date, lon, lat := benchmarkHorizontalInputs()
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b.ReportAllocs()
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b.ResetTimer()
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sink := 0.0
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for i := 0; i < b.N; i++ {
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sink = HourAngle(date, lon, lat)
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}
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benchmarkHorizontalSink = sink
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}
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func BenchmarkMoonAzimuth(b *testing.B) {
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date, lon, lat := benchmarkHorizontalInputs()
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b.ReportAllocs()
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b.ResetTimer()
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sink := 0.0
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for i := 0; i < b.N; i++ {
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sink = Azimuth(date, lon, lat)
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}
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benchmarkHorizontalSink = sink
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}
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func BenchmarkMoonAltitude(b *testing.B) {
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date, lon, lat := benchmarkHorizontalInputs()
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b.ReportAllocs()
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b.ResetTimer()
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sink := 0.0
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for i := 0; i < b.N; i++ {
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sink = Altitude(date, lon, lat)
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}
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benchmarkHorizontalSink = sink
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}
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func BenchmarkMoonZenith(b *testing.B) {
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date, lon, lat := benchmarkHorizontalInputs()
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b.ReportAllocs()
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b.ResetTimer()
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sink := 0.0
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for i := 0; i < b.N; i++ {
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sink = Zenith(date, lon, lat)
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}
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benchmarkHorizontalSink = sink
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}
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func BenchmarkMoonHorizontalLegacy(b *testing.B) {
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date, lon, lat := benchmarkHorizontalInputs()
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jd := basic.Date2JDE(date.UTC())
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entries := []struct {
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name string
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pick func(altitude, azimuth, hourAngle float64) float64
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}{
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{"HourAngle", func(_, _, hourAngle float64) float64 { return hourAngle }},
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{"Azimuth", func(_, azimuth, _ float64) float64 { return azimuth }},
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{"Altitude", func(altitude, _, _ float64) float64 { return altitude }},
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{"Zenith", func(altitude, _, _ float64) float64 { return 90 - altitude }},
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}
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for _, entry := range entries {
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b.Run(entry.name, func(b *testing.B) {
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b.ReportAllocs()
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b.ResetTimer()
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sink := 0.0
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for i := 0; i < b.N; i++ {
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sink = entry.pick(lite.HorizontalCoordinates(ApparentRa(date, lon, lat), ApparentDec(date, lon, lat), jd, lon, lat))
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}
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benchmarkHorizontalSink = sink
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})
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}
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}
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