79 lines
3.6 KiB
Go
79 lines
3.6 KiB
Go
|
package moon
|
|||
|
|
|
|||
|
|
import (
|
|||
|
|
"time"
|
|||
|
|
|
|||
|
|
"b612.me/astro/basic"
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
// MaximumDeclinationInfo 月球最大赤纬事件 / maximum lunar declination event.
|
|||
|
|
type MaximumDeclinationInfo struct {
|
|||
|
|
// Time 事件时刻，UTC / event time in UTC.
|
|||
|
|
Time time.Time
|
|||
|
|
// Declination 该时刻的地心赤纬，单位度 / geocentric declination at the event, in degrees.
|
|||
|
|
Declination float64
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 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.
|
|||
|
|
func MaximumNorthDeclinationsInMonth(year int, month time.Month) []MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfos(basic.MoonMaximumNorthDeclinations(year, month))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 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.
|
|||
|
|
func MaximumSouthDeclinationsInMonth(year int, month time.Month) []MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfos(basic.MoonMaximumSouthDeclinations(year, month))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 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.
|
|||
|
|
func LastMaximumNorthDeclination(date time.Time) MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfo(date, basic.LastMoonMaximumNorthDeclination(timeToUTJDE(date)))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 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.
|
|||
|
|
func NextMaximumNorthDeclination(date time.Time) MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfo(date, basic.NextMoonMaximumNorthDeclination(timeToUTJDE(date)))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// ClosestMaximumNorthDeclination 离指定时刻最近一次月球最大北赤纬 / closest maximum northern lunar declination to date.
|
|||
|
|
func ClosestMaximumNorthDeclination(date time.Time) MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfo(date, basic.ClosestMoonMaximumNorthDeclination(timeToUTJDE(date)))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 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.
|
|||
|
|
func LastMaximumSouthDeclination(date time.Time) MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfo(date, basic.LastMoonMaximumSouthDeclination(timeToUTJDE(date)))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 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.
|
|||
|
|
func NextMaximumSouthDeclination(date time.Time) MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfo(date, basic.NextMoonMaximumSouthDeclination(timeToUTJDE(date)))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// ClosestMaximumSouthDeclination 离指定时刻最近一次月球最大南赤纬 / closest maximum southern lunar declination to date.
|
|||
|
|
func ClosestMaximumSouthDeclination(date time.Time) MaximumDeclinationInfo {
|
|||
|
|
return convertMaximumDeclinationInfo(date, basic.ClosestMoonMaximumSouthDeclination(timeToUTJDE(date)))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func convertMaximumDeclinationInfos(events []basic.DeclinationEvent) []MaximumDeclinationInfo {
|
|||
|
|
result := make([]MaximumDeclinationInfo, 0, len(events))
|
|||
|
|
for _, event := range events {
|
|||
|
|
result = append(result, convertMaximumDeclinationInfo(time.Time{}, event))
|
|||
|
|
}
|
|||
|
|
return result
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func convertMaximumDeclinationInfo(date time.Time, event basic.DeclinationEvent) MaximumDeclinationInfo {
|
|||
|
|
location := time.UTC
|
|||
|
|
if date.Location() != nil {
|
|||
|
|
location = date.Location()
|
|||
|
|
}
|
|||
|
|
return MaximumDeclinationInfo{
|
|||
|
|
Time: basic.JDE2DateByZone(event.JDE, location, false),
|
|||
|
|
Declination: event.Declination,
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func timeToUTJDE(date time.Time) float64 {
|
|||
|
|
return basic.Date2JDE(date.UTC())
|
|||
|
|
}
|