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
91 lines
3.7 KiB
Go
91 lines
3.7 KiB
Go
package eclipse
|
|
|
|
import (
|
|
"time"
|
|
|
|
"b612.me/astro/basic"
|
|
)
|
|
|
|
// SolarEclipseCandidateOptions 批量枚举配置，零值为全部食型的 NASA bulletin Split-K / enumeration options.
|
|
type SolarEclipseCandidateOptions struct {
|
|
// Model 月亮半径模型，零值为 NASA bulletin Split-K / lunar radius model.
|
|
Model SolarEclipseRadiusModel
|
|
// CentralOnly 只保留全食、环食与混合食，含中心线未落到地表的 T0/A0 事件。
|
|
// CentralOnly keeps total, annular, and hybrid eclipses, including T0/A0 events
|
|
// whose axis misses the Earth; the kind filter matches SearchLocalCentralSolarEclipse.
|
|
CentralOnly bool
|
|
// IncludeSaros 附带沙罗序列信息 / attach Saros metadata.
|
|
IncludeSaros bool
|
|
}
|
|
|
|
// SolarEclipseCandidate 一场日食的时刻表条目，不含几何 / geometry-free timetable entry.
|
|
type SolarEclipseCandidate struct {
|
|
// GreatestEclipse 食甚时刻 / greatest-eclipse instant.
|
|
GreatestEclipse time.Time
|
|
// Type 全局食型，Centrality 中心食类型 / global type and centrality.
|
|
Type SolarEclipseType
|
|
Centrality SolarEclipseCentrality
|
|
// Magnitude 与 Gamma 是全局食分与伽马 / global magnitude and gamma.
|
|
Magnitude float64
|
|
Gamma float64
|
|
// Saros 仅在 IncludeSaros 时有效 / valid only with IncludeSaros.
|
|
Saros SarosInfo
|
|
HasSaros bool
|
|
}
|
|
|
|
// 食甚可能早于朔，枚举上界要多留这么多天。
|
|
const solarEclipseCandidateGreatestLeadDays = 0.5
|
|
|
|
// solarEclipseCandidateIsCentral 按全局食型判定，与站心搜索的 Kind 口径一致。
|
|
func solarEclipseCandidateIsCentral(value basic.SolarEclipseType) bool {
|
|
switch value {
|
|
case basic.SolarEclipseTotal, basic.SolarEclipseAnnular, basic.SolarEclipseHybrid:
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// SolarEclipseCandidates 枚举区间内的日食时刻表，按时间升序 / eclipses within a range, in time order.
|
|
func SolarEclipseCandidates(
|
|
start, end time.Time, options SolarEclipseCandidateOptions,
|
|
) []SolarEclipseCandidate {
|
|
if !end.After(start) {
|
|
return nil
|
|
}
|
|
calculator := localSolarEclipseCalculatorForModel(options.Model)
|
|
startTT := solarEclipseTimeToTTJDE(start)
|
|
endTT := solarEclipseTimeToTTJDE(end)
|
|
candidates := make([]SolarEclipseCandidate, 0, 8)
|
|
candidateTT := basic.CalcMoonSHByJDE(startTT, 0)
|
|
for iteration := 0; iteration < localSolarEclipseSearchIterationCap; iteration++ {
|
|
// 食甚可能略早于朔，上界要多留一点余量，否则窗口末尾那场会被漏掉。
|
|
if candidateTT > endTT+solarEclipseCandidateGreatestLeadDays {
|
|
break
|
|
}
|
|
if isPotentialLocalSolarEclipse(candidateTT) {
|
|
globalResult := calculator.global(candidateTT)
|
|
if globalResult.Type != basic.SolarEclipseNone &&
|
|
(!options.CentralOnly || solarEclipseCandidateIsCentral(globalResult.Type)) {
|
|
greatest := solarEclipseTTJDEToTime(globalResult.GreatestEclipse, start.Location())
|
|
// 候选朔月取的是“最近”的朔，可能落在 start 之前或 end 之后（食甚早于朔），
|
|
// 按食甚时刻双侧过滤；注意不能 continue：候选推进在循环末尾，跳过它会原地打转。
|
|
if !greatest.Before(start) && !greatest.After(end) {
|
|
candidate := SolarEclipseCandidate{
|
|
GreatestEclipse: greatest,
|
|
Type: mapBasicSolarEclipseType(globalResult.Type),
|
|
Centrality: mapBasicSolarEclipseCentrality(globalResult.Centrality),
|
|
Magnitude: globalResult.Magnitude,
|
|
Gamma: globalResult.Gamma,
|
|
}
|
|
if options.IncludeSaros {
|
|
candidate.Saros, candidate.HasSaros = solarSarosInfo(globalResult.GreatestEclipse)
|
|
}
|
|
candidates = append(candidates, candidate)
|
|
}
|
|
}
|
|
}
|
|
candidateTT = nextEclipseSearchCandidateTT(candidateTT, 0, 1, localSolarEclipseSynodicMonthDays)
|
|
}
|
|
return candidates
|
|
}
|