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package saturn
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import (
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"b612.me/astro/basic"
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"b612.me/astro/calendar"
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"b612.me/astro/planet"
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"errors"
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"time"
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)
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var (
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ERR_SATURN_NEVER_RISE = errors.New("ERROR:极夜，木星今日永远在地平线下！")
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ERR_SATURN_NEVER_DOWN = errors.New("ERROR:极昼，木星今日永远在地平线上！")
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)
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// ApparentLo 视黄经
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func ApparentLo(date time.Time) float64 {
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jde := calendar.Date2JDE(date)
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return basic.SaturnApparentLo(basic.TD2UT(jde, true))
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}
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// ApparentBo 视黄纬
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func ApparentBo(date time.Time) float64 {
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jde := calendar.Date2JDE(date)
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return basic.SaturnApparentBo(basic.TD2UT(jde, true))
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}
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// ApparentRa 视赤经
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func ApparentRa(date time.Time) float64 {
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jde := calendar.Date2JDE(date)
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return basic.SaturnApparentRa(basic.TD2UT(jde, true))
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}
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// ApparentDec 视赤纬
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func ApparentDec(date time.Time) float64 {
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jde := calendar.Date2JDE(date)
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return basic.SaturnApparentDec(basic.TD2UT(jde, true))
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}
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// ApparentRaDec 视赤经赤纬
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func ApparentRaDec(date time.Time) (float64, float64) {
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jde := calendar.Date2JDE(date)
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return basic.SaturnApparentRaDec(basic.TD2UT(jde, true))
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}
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// ApparentMagnitude 视星等
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func ApparentMagnitude(date time.Time) float64 {
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jde := calendar.Date2JDE(date)
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return basic.SaturnMag(basic.TD2UT(jde, true))
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}
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// EarthDistance 与地球距离（天文单位）
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func EarthDistance(date time.Time) float64 {
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jde := calendar.Date2JDE(date)
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return basic.EarthSaturnAway(basic.TD2UT(jde, true))
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}
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// EarthDistance 与太阳距离（天文单位）
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func SunDistance(date time.Time) float64 {
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jde := calendar.Date2JDE(date)
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return planet.WherePlanet(5, 2, basic.TD2UT(jde, true))
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}
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// Zenith 高度角
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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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timezone := float64(loc) / 3600.0
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return basic.SaturnHeight(jde, lon, lat, timezone)
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}
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// Azimuth 方位角
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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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timezone := float64(loc) / 3600.0
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return basic.SaturnAzimuth(jde, lon, lat, timezone)
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}
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// HourAngle 时角
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// 返回给定经纬度、对应date时区date时刻的时角（
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func HourAngle(date time.Time, lon float64) float64 {
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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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return basic.SaturnHourAngle(jde, lon, timezone)
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}
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// CulminationTime 中天时间
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// 返回给定经纬度、对应date时区date时刻的中天日期
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func CulminationTime(date time.Time, lon 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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timezone := float64(loc) / 3600.0
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calcJde := basic.SaturnCulminationTime(jde, lon, timezone) - timezone/24.00
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return basic.JDE2DateByZone(calcJde, date.Location(), false)
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}
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// RiseTime 升起时间
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// date，取日期，时区忽略
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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，true时进行大气修正
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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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var aeroFloat float64
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if aero {
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aeroFloat = 1
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}
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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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riseJde := basic.SaturnRiseTime(jde, lon, lat, timezone, aeroFloat, height)
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if riseJde == -2 {
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err = ERR_SATURN_NEVER_RISE
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}
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if riseJde == -1 {
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err = ERR_SATURN_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 落下时间
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// date，取日期，时区忽略
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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，true时进行大气修正
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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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var aeroFloat float64
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if aero {
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aeroFloat = 1
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}
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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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riseJde := basic.SaturnDownTime(jde, lon, lat, timezone, aeroFloat, height)
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if riseJde == -2 {
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err = ERR_SATURN_NEVER_RISE
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}
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if riseJde == -1 {
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err = ERR_SATURN_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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// LastConjunction 上次合日时间
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// 返回上次合日时间
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func LastConjunction(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.LastSaturnConjunction(jde), date.Location(), false)
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}
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// NextConjunction 下次合日时间
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// 返回下次合日时间
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func NextConjunction(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.NextSaturnConjunction(jde), date.Location(), false)
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}
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// LastOpposition 上次冲日时间
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// 返回上次冲日时间
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func LastOpposition(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.LastSaturnOpposition(jde), date.Location(), false)
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}
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// NextOpposition 下次冲日时间
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// 返回下次冲日时间
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func NextOpposition(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.NextSaturnOpposition(jde), date.Location(), false)
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}
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// LastProgradeToRetrograde 上次留（顺转逆）
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// 返回上次顺转逆留的时间
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func LastProgradeToRetrograde(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.LastSaturnProgradeToRetrograde(jde), date.Location(), false)
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}
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// NextProgradeToRetrograde 下次留（顺转逆）
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// 返回下次顺转逆留的时间
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func NextProgradeToRetrograde(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.NextSaturnProgradeToRetrograde(jde), date.Location(), false)
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}
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// LastRetrogradeToPrograde 上次留（逆转瞬）
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// 返回上次逆转瞬留的时间
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func LastRetrogradeToPrograde(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.LastSaturnRetrogradeToPrograde(jde), date.Location(), false)
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}
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// NextRetrogradeToPrograde 上次留（逆转瞬）
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//// 返回上次逆转瞬留的时间
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func NextRetrogradeToPrograde(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.NextSaturnRetrogradeToPrograde(jde), date.Location(), false)
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}
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// LastEasternQuadrature 上次东方照时间
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// 返回上次东方照时间
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func LastEasternQuadrature(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.LastSaturnEasternQuadrature(jde), date.Location(), false)
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}
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// NextEasternQuadrature 下次东方照时间
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// 返回下次东方照时间
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func NextEasternQuadrature(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.NextSaturnEasternQuadrature(jde), date.Location(), false)
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}
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// LastWesternQuadrature 上次西方照时间
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// 返回上次西方照时间
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func LastWesternQuadrature(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.LastSaturnWesternQuadrature(jde), date.Location(), false)
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}
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// NextWesternQuadrature 下次西方照时间
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// 返回下次西方照时间
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func NextWesternQuadrature(date time.Time) time.Time {
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jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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return basic.JDE2DateByZone(basic.NextSaturnWesternQuadrature(jde), date.Location(), false)
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}
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