96 lines
4.1 KiB
Go
96 lines
4.1 KiB
Go
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package basic
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import (
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"math"
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"testing"
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"time"
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)
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// 本文件核实太阳中天（floor 正午锚点）与月亮中天（floor+0.5 午夜锚点）两套锚点：
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// 调用方按各自约定补偿后，两者都必须落在同一个本地民用日，并接近当日本地日的真实中天。
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//
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// 框架约定（由各自调用方固定下来）：
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// - SunHeight/HMoonHeight 的 jd 是本地民用时框架，本地民用日从 Date2JDE(本地 0 时) 起算；
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// - basic.CulminationTime 的返回值是本地民用时框架，sun/sun.go 减 tz/24 得到 UT；
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// - basic.MoonCulminationTime 的返回值就是本地民用时框架，moon/moon.go 按 byZone=true 使用。
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type culminationAnchorSite struct {
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name string
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lon float64
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lat float64
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tz float64
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}
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var culminationAnchorSites = []culminationAnchorSite{
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{"beijing", 116.4074, 39.9042, 8},
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{"utc", 0, 0, 0},
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{"newyork", -74, 40.7, -5},
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{"adelaide", 138.6, -34.9, 9.5},
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{"chatham", -176.5, -43.9, 12.75},
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{"kiritimati", -157.4, 1.9, 14},
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}
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func culminationAnchorLocalMidnight(site culminationAnchorSite, timestamp time.Time) (time.Time, float64) {
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location := time.FixedZone("anchor", int(site.tz*3600))
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local := time.Date(timestamp.Year(), timestamp.Month(), timestamp.Day(), 0, 0, 0, 0, location)
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return local, Date2JDE(local)
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}
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func TestSunCulminationAnchorKeepsLocalDay(t *testing.T) {
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timestamp := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
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for _, site := range culminationAnchorSites {
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local, midnightJD := culminationAnchorLocalMidnight(site, timestamp)
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location := local.Location()
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// sun/sun.go 的补偿：本地 0 时 JD 再加半天，使 floor 落在同一本地日；随后减 tz/24 得 UT。
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got := JDE2DateByZone(CulminationTime(midnightJD+0.5, site.lon, site.tz)-site.tz/24, location, false)
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truthJD, truthAltitude := 0.0, -999.0
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for minute := 0; minute <= 24*60; minute++ {
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jd := midnightJD + float64(minute)/1440.0
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if altitude := SunHeight(jd, site.lon, site.lat, site.tz); altitude > truthAltitude {
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truthAltitude, truthJD = altitude, jd
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}
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}
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truth := JDE2DateByZone(truthJD-site.tz/24, location, false)
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if got.Day() != local.Day() || got.Month() != local.Month() {
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t.Fatalf("%s: sun culmination = %s, want local day %s", site.name, got.Format("2006-01-02 15:04"), local.Format("2006-01-02"))
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}
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if deviation := math.Abs(got.Sub(truth).Minutes()); deviation > 1.5 {
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t.Fatalf("%s: sun culmination deviates %.2f min from the daily altitude maximum", site.name, deviation)
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}
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}
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}
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func TestMoonCulminationAnchorKeepsLocalDay(t *testing.T) {
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timestamp := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
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for _, site := range culminationAnchorSites {
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local, midnightJD := culminationAnchorLocalMidnight(site, timestamp)
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location := local.Location()
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got := JDE2DateByZone(MoonCulminationTime(midnightJD, site.lon, site.lat, site.tz), location, true)
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truthJD, truthAltitude := 0.0, -999.0
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for minute := 0; minute <= 24*60; minute++ {
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jd := midnightJD + float64(minute)/1440.0
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if altitude := HMoonHeight(jd, site.lon, site.lat, site.tz); altitude > truthAltitude {
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truthAltitude, truthJD = altitude, jd
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}
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}
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truth := JDE2DateByZone(truthJD, location, true)
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if got.Day() != local.Day() || got.Month() != local.Month() {
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t.Fatalf("%s: moon culmination = %s, want local day %s", site.name, got.Format("2006-01-02 15:04"), local.Format("2006-01-02"))
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}
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if deviation := math.Abs(got.Sub(truth).Minutes()); deviation > 6.0 {
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t.Fatalf("%s: moon culmination deviates %.2f min from the daily altitude maximum", site.name, deviation)
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}
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}
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}
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func TestSunCulminationAnchorDiffersFromMidnightAnchor(t *testing.T) {
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site := culminationAnchorSites[0]
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_, midnightJD := culminationAnchorLocalMidnight(site, time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC))
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// 不补半天时 floor 落在相邻的 UT 日：这正是调用方必须补偿 +0.5 的原因。
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uncompensated := CulminationTime(midnightJD, site.lon, site.tz) - site.tz/24
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compensated := CulminationTime(midnightJD+0.5, site.lon, site.tz) - site.tz/24
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if math.Abs(uncompensated-compensated) < 0.4 {
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t.Fatalf("expected the uncompensated anchor to land on an adjacent day: %.6f vs %.6f", uncompensated, compensated)
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}
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}
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