b612
16c62a97d5
- 新增时标、ΔT 模型、质心时间与 UT1 支持 - 改进日月食、月掩、行星事件及路径边界计算 - 完善恒星三维自行与动态距离传播 - 扩展 SVG、GeoJSON、KML 输出与底层距离换算工具 - 整理中英文手册、示例资源及回归测试
79 lines
3.6 KiB
Go
79 lines
3.6 KiB
Go
package moon
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import (
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"time"
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"b612.me/astro/basic"
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)
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// MaximumDeclinationInfo 月球最大赤纬事件 / maximum lunar declination event.
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type MaximumDeclinationInfo struct {
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// Time 事件时刻，UTC / event time in UTC.
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Time time.Time
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// Declination 该时刻的地心赤纬，单位度 / geocentric declination at the event, in degrees.
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Declination float64
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}
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// MaximumNorthDeclinationsInMonth 指定年月内的所有月球最大北赤纬事件 / all maximum northern lunar declination events in the given Gregorian month.
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func MaximumNorthDeclinationsInMonth(year int, month time.Month) []MaximumDeclinationInfo {
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return convertMaximumDeclinationInfos(basic.MoonMaximumNorthDeclinations(year, month))
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}
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// MaximumSouthDeclinationsInMonth 指定年月内的所有月球最大南赤纬事件 / all maximum southern lunar declination events in the given Gregorian month.
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func MaximumSouthDeclinationsInMonth(year int, month time.Month) []MaximumDeclinationInfo {
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return convertMaximumDeclinationInfos(basic.MoonMaximumSouthDeclinations(year, month))
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}
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// LastMaximumNorthDeclination 指定时刻之前最近一次月球最大北赤纬 / last maximum northern lunar declination at or before date.
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func LastMaximumNorthDeclination(date time.Time) MaximumDeclinationInfo {
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return convertMaximumDeclinationInfo(date, basic.LastMoonMaximumNorthDeclination(timeToUTJDE(date)))
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}
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// NextMaximumNorthDeclination 指定时刻之后最近一次月球最大北赤纬 / next maximum northern lunar declination after date.
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func NextMaximumNorthDeclination(date time.Time) MaximumDeclinationInfo {
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return convertMaximumDeclinationInfo(date, basic.NextMoonMaximumNorthDeclination(timeToUTJDE(date)))
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}
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// ClosestMaximumNorthDeclination 离指定时刻最近一次月球最大北赤纬 / closest maximum northern lunar declination to date.
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func ClosestMaximumNorthDeclination(date time.Time) MaximumDeclinationInfo {
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return convertMaximumDeclinationInfo(date, basic.ClosestMoonMaximumNorthDeclination(timeToUTJDE(date)))
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}
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// LastMaximumSouthDeclination 指定时刻之前最近一次月球最大南赤纬 / last maximum southern lunar declination at or before date.
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func LastMaximumSouthDeclination(date time.Time) MaximumDeclinationInfo {
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return convertMaximumDeclinationInfo(date, basic.LastMoonMaximumSouthDeclination(timeToUTJDE(date)))
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}
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// NextMaximumSouthDeclination 指定时刻之后最近一次月球最大南赤纬 / next maximum southern lunar declination after date.
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func NextMaximumSouthDeclination(date time.Time) MaximumDeclinationInfo {
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return convertMaximumDeclinationInfo(date, basic.NextMoonMaximumSouthDeclination(timeToUTJDE(date)))
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}
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// ClosestMaximumSouthDeclination 离指定时刻最近一次月球最大南赤纬 / closest maximum southern lunar declination to date.
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func ClosestMaximumSouthDeclination(date time.Time) MaximumDeclinationInfo {
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return convertMaximumDeclinationInfo(date, basic.ClosestMoonMaximumSouthDeclination(timeToUTJDE(date)))
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}
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func convertMaximumDeclinationInfos(events []basic.DeclinationEvent) []MaximumDeclinationInfo {
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result := make([]MaximumDeclinationInfo, 0, len(events))
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for _, event := range events {
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result = append(result, convertMaximumDeclinationInfo(time.Time{}, event))
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}
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return result
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}
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func convertMaximumDeclinationInfo(date time.Time, event basic.DeclinationEvent) MaximumDeclinationInfo {
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location := time.UTC
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if date.Location() != nil {
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location = date.Location()
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}
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return MaximumDeclinationInfo{
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Time: basic.JD2DateByZone(event.JD, location, false),
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Declination: event.Declination,
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}
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}
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func timeToUTJDE(date time.Time) float64 {
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return basic.Date2JD(date.UTC())
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}
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