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
65 lines
2.1 KiB
Go
65 lines
2.1 KiB
Go
package eclipse
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import (
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"time"
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"b612.me/astro/basic"
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"b612.me/astro/tools"
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)
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func moonSunLoDiff(date time.Time) float64 {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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sunLo := basic.HSunApparentLo(jde)
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moonLo := basic.HMoonApparentLo(jde)
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return tools.Limit360(moonLo - sunLo)
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}
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func solarAltitude(date time.Time, lon, lat float64) float64 {
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jde := basic.Date2JDE(date)
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_, loc := date.Zone()
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return basic.SunHeight(jde, lon, lat, float64(loc)/3600.0)
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}
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func solarCulminationTime(date time.Time, lon float64) time.Time {
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jde := basic.Date2JDE(date.Add(time.Duration(-1*date.Hour())*time.Hour)) + 0.5
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_, loc := date.Zone()
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timezone := float64(loc) / 3600.0
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calcJde := basic.CulminationTime(jde, lon, timezone) - timezone/24.0
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return basic.JDE2DateByZone(calcJde, date.Location(), false)
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}
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func lunarAzimuth(date time.Time, lon, lat float64) float64 {
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jde := basic.Date2JDE(date)
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_, loc := date.Zone()
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return basic.HMoonAzimuth(jde, lon, lat, float64(loc)/3600.0)
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}
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func lunarAltitude(date time.Time, lon, lat float64) float64 {
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jde := basic.Date2JDE(date)
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_, loc := date.Zone()
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return basic.HMoonHeight(jde, lon, lat, float64(loc)/3600.0)
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}
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func lunarCulminationTime(date time.Time, lon, lat float64) time.Time {
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if date.Hour() > 12 {
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date = date.Add(-12 * time.Hour)
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}
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jde := basic.Date2JDE(date)
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_, loc := date.Zone()
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culmination := basic.JDE2DateByZone(basic.MoonCulminationTime(jde, lon, lat, float64(loc)/3600.0), date.Location(), true)
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// MoonCulminationTime returns the nearest root to its internal midnight
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// seed, which can land one civil day later when the input is local noon.
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// Visibility scans need the root belonging to the supplied local day.
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if culmination.Year() != date.Year() || culmination.YearDay() != date.YearDay() {
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// Preserve the solved local clock time while moving it onto the
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// requested civil date. This also avoids assuming every DST day is
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// exactly 24 elapsed hours.
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culmination = time.Date(
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date.Year(), date.Month(), date.Day(),
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culmination.Hour(), culmination.Minute(), culmination.Second(), culmination.Nanosecond(),
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date.Location(),
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)
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}
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return culmination
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}
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