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