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astro/moon/moon.go

346 lines
9.0 KiB
Go

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package moon
import (
"errors"
"math"
"time"
"b612.me/astro/basic"
)
var (
ERR_MOON_NEVER_RISE = errors.New("ERROR:极夜,月亮在今日永远在地平线下!")
ERR_MOON_NEVER_DOWN = errors.New("ERROR:极昼,月亮在今日永远在地平线上!")
ERR_NOT_TODAY = errors.New("ERROR:月亮已在(昨日/明日)(升起/降下)")
)
// TrueLo 月亮真黄经
func TrueLo(date time.Time) float64 {
jde := basic.Date2JDE(date.UTC())
return basic.HMoonTrueLo(basic.TD2UT(jde, true))
}
// TrueBo 月亮真黄纬
func TrueBo(date time.Time) float64 {
jde := basic.Date2JDE(date.UTC())
return basic.HMoonTrueBo(basic.TD2UT(jde, true))
}
// ApparentLo 月亮视黄经(地心)
// 传入UTC对应的儒略日时间
func ApparentLo(date time.Time) float64 {
jde := basic.Date2JDE(date.UTC())
return basic.HMoonApparentLo(basic.TD2UT(jde, true))
}
// TrueRa 月亮视赤经(地心)
// date, 时间
// 返回地心坐标
func TrueRa(date time.Time) float64 {
jde := basic.Date2JDE(date.UTC())
return basic.HMoonTrueRa(basic.TD2UT(jde, true))
}
// TrueDec 月亮视赤纬(地心)
// date, 时间
// 返回地心坐标
func TrueDec(date time.Time) float64 {
jde := basic.Date2JDE(date.UTC())
return basic.HMoonTrueDec(basic.TD2UT(jde, true))
}
// TrueRaDec 月亮视赤纬赤纬(地心)
// date, 时间
// 返回地心坐标
func TrueRaDec(date time.Time) (float64, float64) {
jde := basic.Date2JDE(date.UTC())
return basic.HMoonTrueRaDec(basic.TD2UT(jde, true))
}
// ApparentRa 月亮视赤经(站心)
// date, 时间
// lon, 经度
// lat, 纬度
// 返回站心坐标
func ApparentRa(date time.Time, lon, lat float64) float64 {
jde := basic.Date2JDE(date)
_, loc := date.Zone()
return basic.HMoonApparentRa(jde, lon, lat, float64(loc)/3600.0)
}
// ApparentDec 月亮视赤纬(站心)
// date, 时间
// lon, 经度
// lat, 纬度
// 返回站心坐标
func ApparentDec(date time.Time, lon, lat float64) float64 {
jde := basic.Date2JDE(date)
_, loc := date.Zone()
return basic.HMoonApparentDec(jde, lon, lat, float64(loc)/3600.0)
}
// ApparentRaDec 月亮视赤纬(站心)
// date, 本地时间
// lon, 经度
// lat, 纬度
// 返回站心坐标
func ApparentRaDec(date time.Time, lon, lat float64) (float64, float64) {
jde := basic.Date2JDE(date)
_, loc := date.Zone()
return basic.HMoonApparentRaDec(jde, lon, lat, float64(loc)/3600.0)
}
// HourAngle 月亮时角
// date, 世界时(忽略此处时区)
// lon经度东正西负
// lat纬度北正南负
func HourAngle(date time.Time, lon, lat float64) float64 {
jde := basic.Date2JDE(date)
_, loc := date.Zone()
return basic.MoonTimeAngle(jde, lon, lat, float64(loc)/3600.0)
}
// Azimuth 月亮方位角
// date, 世界时(忽略此处时区)
// lon经度东正西负
// lat纬度北正南负
func Azimuth(date time.Time, lon, lat float64) float64 {
jde := basic.Date2JDE(date)
_, loc := date.Zone()
return basic.HMoonAngle(jde, lon, lat, float64(loc)/3600.0)
}
// Zenith 月亮高度角
// date, 世界时(忽略此处时区)
// lon经度东正西负
// lat纬度北正南负
func Zenith(date time.Time, lon, lat float64) float64 {
jde := basic.Date2JDE(date)
_, loc := date.Zone()
return basic.HMoonHeight(jde, lon, lat, float64(loc)/3600.0)
}
// CulminationTime 月亮中天时间
// date, 世界时(忽略此处时区)
// lon经度东正西负
// lat纬度北正南负
func CulminationTime(date time.Time, lon, lat float64) time.Time {
jde := basic.Date2JDE(date)
_, loc := date.Zone()
return basic.JDE2DateByZone(basic.MoonCulminationTime(jde, lon, lat, float64(loc)/3600.0), date.Location(), true)
}
// RiseTime 月亮升起时间
// date, 世界时(忽略此处时区)
// lon经度东正西负
// lat纬度北正南负
// height高度
// aero,是否进行大气修正
func RiseTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
var err error
if date.Hour() > 12 {
date = date.Add(time.Hour * -12)
}
jde := basic.Date2JDE(date)
_, loc := date.Zone()
timezone := float64(loc) / 3600.0
aeroFloat := 0.00
if aero {
aeroFloat = 1
}
riseJde := basic.GetMoonRiseTime(jde, lon, lat, timezone, aeroFloat, height)
if riseJde == -3 {
err = ERR_NOT_TODAY
}
if riseJde == -2 {
err = ERR_MOON_NEVER_RISE
}
if riseJde == -1 {
err = ERR_MOON_NEVER_DOWN
}
return basic.JDE2DateByZone(riseJde, date.Location(), true), err
}
// DownTime 月亮降下时间
// date, 世界时(忽略此处时区)
// lon经度东正西负
// lat纬度北正南负
// height高度
// aero大气修正
func DownTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
var err error
if date.Hour() > 12 {
date = date.Add(time.Hour * -12)
}
jde := basic.Date2JDE(date)
_, loc := date.Zone()
timezone := float64(loc) / 3600.0
aeroFloat := 0.00
if aero {
aeroFloat = 1
}
downJde := basic.GetMoonDownTime(jde, lon, lat, timezone, aeroFloat, height)
if downJde == -3 {
err = ERR_NOT_TODAY
}
if downJde == -2 {
err = ERR_MOON_NEVER_RISE
}
if downJde == -1 {
err = ERR_MOON_NEVER_DOWN
}
return basic.JDE2DateByZone(downJde, date.Location(), true), err
}
// Phase 月相
// 返回Date对应UTC世界时的月相大小
func Phase(date time.Time) float64 {
jde := basic.Date2JDE(date.UTC())
return basic.MoonLight(basic.TD2UT(jde, true))
}
// ShuoYue 朔月
func ShuoYue(year float64) time.Time {
jde := basic.TD2UT(basic.CalcMoonSH(year, 0), false)
return basic.JDE2DateByZone(jde, time.UTC, false)
}
func NextShuoYue(date time.Time) time.Time {
return nextMoonPhase(date, 0)
}
func LastShuoYue(date time.Time) time.Time {
return lastMoonPhase(date, 0)
}
func ClosestShuoYue(date time.Time) time.Time {
return closestMoonPhase(date, 0)
}
func closestMoonPhase(date time.Time, typed int) time.Time {
//0=shuo 1=wang 2=shangxian 3=xiaxian
jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
if typed < 2 {
return basic.JDE2DateByZone(basic.TD2UT(basic.CalcMoonSHByJDE(jde, typed), false), date.Location(), false)
}
return basic.JDE2DateByZone(basic.TD2UT(basic.CalcMoonXHByJDE(jde, typed-2), false), date.Location(), false)
}
func nextMoonPhase(date time.Time, typed int) time.Time {
//0=shuo 1=wang 2=shangxian 3=xiaxian
diffCode := 0.00
switch typed {
case 1:
diffCode = 180
case 2:
diffCode = 90
case 3:
diffCode = 270
}
jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
cost := basic.HMoonApparentLo(jde) - basic.HSunApparentLo(jde) - float64(diffCode)
for cost < 0 {
cost += 360
}
if cost < 0 && math.Floor(math.Abs(cost)*10000) == 0 {
cost = 0
}
if cost < 240 {
jde += (240 - cost) / 11.19
}
if typed < 2 {
return basic.JDE2DateByZone(basic.TD2UT(basic.CalcMoonSHByJDE(jde, typed), false), date.Location(), false)
}
return basic.JDE2DateByZone(basic.TD2UT(basic.CalcMoonXHByJDE(jde, typed-2), false), date.Location(), false)
}
func lastMoonPhase(date time.Time, typed int) time.Time {
//0=shuo 1=wang 2=shangxian 3=xiaxian
diffCode := 0.00
switch typed {
case 1:
diffCode = 180
case 2:
diffCode = 90
case 3:
diffCode = 270
}
jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
cost := basic.HMoonApparentLo(jde) - basic.HSunApparentLo(jde) - float64(diffCode)
for cost < 0 {
cost += 360
}
if cost > 0 && math.Floor(math.Abs(cost)*10000) == 0 {
cost = 360
}
if cost > 120 {
jde -= (cost - 120) / 11.19
}
if typed < 2 {
return basic.JDE2DateByZone(basic.TD2UT(basic.CalcMoonSHByJDE(jde, typed), false), date.Location(), false)
}
return basic.JDE2DateByZone(basic.TD2UT(basic.CalcMoonXHByJDE(jde, typed-2), false), date.Location(), false)
}
// WangYue 望月
func WangYue(year float64) time.Time {
jde := basic.TD2UT(basic.CalcMoonSH(year, 1), false)
return basic.JDE2DateByZone(jde, time.UTC, false)
}
func NextWangYue(date time.Time) time.Time {
return nextMoonPhase(date, 1)
}
func LastWangYue(date time.Time) time.Time {
return lastMoonPhase(date, 1)
}
func ClosestWangYue(date time.Time) time.Time {
return closestMoonPhase(date, 1)
}
// ShangXianYue 上弦月
func ShangXianYue(year float64) time.Time {
jde := basic.TD2UT(basic.CalcMoonXH(year, 0), false)
return basic.JDE2DateByZone(jde, time.UTC, false)
}
func NextShangXianYue(date time.Time) time.Time {
return nextMoonPhase(date, 2)
}
func LastShangXianYue(date time.Time) time.Time {
return lastMoonPhase(date, 2)
}
func ClosestShangXianYue(date time.Time) time.Time {
return closestMoonPhase(date, 2)
}
// XiaXianYue 下弦月
func XiaXianYue(year float64) time.Time {
jde := basic.TD2UT(basic.CalcMoonXH(year, 1), false)
return basic.JDE2DateByZone(jde, time.UTC, false)
}
func NextXiaXianYue(date time.Time) time.Time {
return nextMoonPhase(date, 3)
}
func LastXiaXianYue(date time.Time) time.Time {
return lastMoonPhase(date, 3)
}
func ClosestXiaXianYue(date time.Time) time.Time {
return closestMoonPhase(date, 3)
}
// EarthDistance 日地距离
// 返回date对应UTC世界时日地距离
func EarthDistance(date time.Time) float64 {
jde := basic.Date2JDE(date)
jde = basic.TD2UT(jde, true)
return basic.MoonAway(jde)
}