315 lines
14 KiB
Go
315 lines
14 KiB
Go
package jupiter
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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_JUPITER_NEVER_RISE = errors.New("ERROR:极夜，木星今日永远在地平线下！")
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ERR_JUPITER_NEVER_SET = errors.New("ERROR:极昼，木星今日永远在地平线上！")
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// ERR_JUPITER_NEVER_DOWN deprecated: -- use ERR_JUPITER_NEVER_SET instead
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ERR_JUPITER_NEVER_DOWN = ERR_JUPITER_NEVER_SET
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)
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func riseSetResult(date time.Time, jde float64, err error) (time.Time, error) {
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if err != nil {
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switch {
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case errors.Is(err, basic.ErrNeverRise):
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return time.Time{}, ERR_JUPITER_NEVER_RISE
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case errors.Is(err, basic.ErrNeverSet):
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return time.Time{}, ERR_JUPITER_NEVER_SET
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default:
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return time.Time{}, err
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}
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}
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return basic.JDE2DateByZone(jde, date.Location(), true), nil
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}
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// ApparentLo 视黄经 / apparent ecliptic longitude.
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//
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// 返回木星在 date 对应绝对时刻的瞬时视黄经，单位度。
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// Returns the apparent ecliptic longitude of Jupiter at the instant represented by date, in degrees.
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func ApparentLo(date time.Time) float64 {
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jde := calendar.Date2JDE(date.UTC())
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return basic.JupiterApparentLo(basic.TD2UT(jde, true))
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}
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// ApparentBo 视黄纬 / apparent ecliptic latitude.
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//
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// 返回木星在 date 对应绝对时刻的瞬时视黄纬，单位度。
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// Returns the apparent ecliptic latitude of Jupiter at the instant represented by date, in degrees.
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func ApparentBo(date time.Time) float64 {
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jde := calendar.Date2JDE(date.UTC())
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return basic.JupiterApparentBo(basic.TD2UT(jde, true))
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}
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// ApparentRa 视赤经 / apparent right ascension.
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//
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// 返回木星在 date 对应绝对时刻的瞬时视赤经，单位度。
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// Returns the apparent right ascension of Jupiter at the instant represented by date, in degrees.
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func ApparentRa(date time.Time) float64 {
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jde := calendar.Date2JDE(date.UTC())
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return basic.JupiterApparentRa(basic.TD2UT(jde, true))
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}
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// ApparentDec 视赤纬 / apparent declination.
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//
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// 返回木星在 date 对应绝对时刻的瞬时视赤纬，单位度。
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// Returns the apparent declination of Jupiter at the instant represented by date, in degrees.
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func ApparentDec(date time.Time) float64 {
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jde := calendar.Date2JDE(date.UTC())
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return basic.JupiterApparentDec(basic.TD2UT(jde, true))
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}
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// ApparentRaDec 视赤经、视赤纬 / apparent right ascension and declination.
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//
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// 返回木星在 date 对应绝对时刻的瞬时视赤经与视赤纬，单位度。
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// Returns the apparent right ascension and declination of Jupiter at the instant represented by date, in degrees.
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func ApparentRaDec(date time.Time) (float64, float64) {
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jde := calendar.Date2JDE(date.UTC())
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return basic.JupiterApparentRaDec(basic.TD2UT(jde, true))
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}
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// ApparentMagnitude 视星等 / apparent magnitude.
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//
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// 返回木星在 date 对应绝对时刻的视星等。
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// Returns the apparent visual magnitude of Jupiter at the instant represented by date.
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func ApparentMagnitude(date time.Time) float64 {
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jde := calendar.Date2JDE(date.UTC())
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return basic.JupiterMag(basic.TD2UT(jde, true))
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}
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// EarthDistance 地心距离 / Earth distance.
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//
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// 返回木星在 date 对应绝对时刻到地球的距离，单位 AU。
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// Returns the distance from Jupiter to Earth at the instant represented by date, in astronomical units.
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func EarthDistance(date time.Time) float64 {
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jde := calendar.Date2JDE(date.UTC())
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return basic.EarthJupiterAway(basic.TD2UT(jde, true))
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}
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// SunDistance 日心距离 / Sun distance.
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//
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// 返回木星在 date 对应绝对时刻到太阳的距离，单位 AU。
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// Returns the distance from Jupiter to the Sun at the instant represented by date, in astronomical units.
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func SunDistance(date time.Time) float64 {
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jde := calendar.Date2JDE(date.UTC())
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return planet.WherePlanet(4, 2, basic.TD2UT(jde, true))
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}
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// Altitude 高度角 / altitude.
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//
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// date 表示观测时刻，会读取其时区参与地方时计算；lon 为观测者经度，东正西负；lat 为观测者纬度，北正南负。返回值单位度。
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// date is the observing instant and its zone offset participates in local-time calculations. lon is east-positive longitude, lat is north-positive latitude, and the result is in degrees.
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func Altitude(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.JupiterHeight(jde, lon, lat, timezone)
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}
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// Zenith 天顶距 / zenith distance.
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//
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// 参数与 Altitude 相同，返回值为对应时刻的天顶距，单位度。
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// Uses the same inputs as Altitude and returns the zenith distance in degrees.
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func Zenith(date time.Time, lon, lat float64) float64 {
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return 90 - Altitude(date, lon, lat)
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}
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// Azimuth 方位角 / azimuth.
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//
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// date 表示观测时刻，会读取其时区参与地方时计算；lon 为观测者经度，东正西负；lat 为观测者纬度，北正南负。返回值按正北为 0°、向东增加。
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// date is the observing instant and its zone offset participates in local-time calculations. lon is east-positive longitude, lat is north-positive latitude, and azimuth is measured from north toward east.
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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.JupiterAzimuth(jde, lon, lat, timezone)
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}
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// HourAngle 时角 / hour angle.
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//
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// date 表示观测时刻，会读取其时区参与地方时计算；lon 为观测者经度，东正西负。返回值单位度。
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// date is the observing instant and its zone offset participates in local-time calculations. lon is east-positive longitude and the returned hour angle is in degrees.
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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.JupiterHourAngle(jde, lon, timezone)
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}
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// CulminationTime 中天时刻 / culmination time.
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//
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// date 取其所在时区的当地日期，返回值保持相同时区；lon 为观测者经度，东正西负。
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// date is interpreted on its local civil day and the result keeps the same time zone. lon is east-positive longitude.
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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.JupiterCulminationTime(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 / rise time.
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//
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// date 取其所在时区的当地日期，返回值保持相同时区；lon 为东正西负经度，lat 为北正南负纬度；height 为观测点海拔高度（米）；aero 为 true 时加入标准大气折射。
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// date is interpreted on its local civil day and the result keeps the same time zone. lon is east-positive longitude, lat is north-positive latitude, height is observer elevation in meters, and aero enables standard atmospheric refraction.
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func RiseTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, 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, err := basic.JupiterRiseTime(jde, lon, lat, timezone, aeroFloat, height)
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return riseSetResult(date, riseJde, err)
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}
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// DownTime 落下时间别名 / deprecated set-time alias.
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//
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// Deprecated: use SetTime instead.
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//
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// 参数与 SetTime 相同，仅为兼容旧接口保留。
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// Same as SetTime and kept only for backward compatibility.
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func DownTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
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return SetTime(date, lon, lat, height, aero)
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}
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// SetTime 落下时间 / set time.
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//
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// 参数与 RiseTime 相同，返回给定当地日期内的落下时刻。
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// Uses the same inputs as RiseTime and returns the set time on the corresponding local civil day.
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func SetTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, 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, err := basic.JupiterSetTime(jde, lon, lat, timezone, aeroFloat, height)
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return riseSetResult(date, riseJde, err)
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}
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// LastConjunction 上一次合日 / previous conjunction with the Sun.
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//
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// 返回 date 当前或之前最近一次与太阳的合日时刻，结果保持 date 的时区。
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// Returns the nearest conjunction with the Sun at or before date, keeping date's time zone.
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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.LastJupiterConjunction(jde), date.Location(), false)
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}
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// NextConjunction 下一次合日 / next conjunction with the Sun.
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//
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// 返回 date 当前或之后最近一次与太阳的合日时刻，结果保持 date 的时区。
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// Returns the nearest conjunction with the Sun at or after date, keeping date's time zone.
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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.NextJupiterConjunction(jde), date.Location(), false)
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}
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// LastOpposition 上一次冲日 / previous opposition.
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//
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// 返回 date 当前或之前最近一次冲日时刻，结果保持 date 的时区。
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// Returns the nearest opposition at or before date, keeping date's time zone.
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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.LastJupiterOpposition(jde), date.Location(), false)
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}
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// NextOpposition 下一次冲日 / next opposition.
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//
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// 返回 date 当前或之后最近一次冲日时刻，结果保持 date 的时区。
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// Returns the nearest opposition at or after date, keeping date's time zone.
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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.NextJupiterOpposition(jde), date.Location(), false)
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}
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// LastProgradeToRetrograde 上一次顺行转逆行留 / previous station from prograde to retrograde.
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//
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// 返回 date 当前或之前最近一次由顺行转为逆行的留时刻，结果保持 date 的时区。
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// Returns the nearest station at or before date where motion changes from prograde to retrograde, keeping date's time zone.
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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.LastJupiterProgradeToRetrograde(jde), date.Location(), false)
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}
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// NextProgradeToRetrograde 下一次顺行转逆行留 / next station from prograde to retrograde.
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//
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// 返回 date 当前或之后最近一次由顺行转为逆行的留时刻，结果保持 date 的时区。
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// Returns the nearest station at or after date where motion changes from prograde to retrograde, keeping date's time zone.
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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.NextJupiterProgradeToRetrograde(jde), date.Location(), false)
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}
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// LastRetrogradeToPrograde 上一次逆行转顺行留 / previous station from retrograde to prograde.
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//
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// 返回 date 当前或之前最近一次由逆行转为顺行的留时刻，结果保持 date 的时区。
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// Returns the nearest station at or before date where motion changes from retrograde to prograde, keeping date's time zone.
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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.LastJupiterRetrogradeToPrograde(jde), date.Location(), false)
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}
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// NextRetrogradeToPrograde 下一次逆行转顺行留 / next station from retrograde to prograde.
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//
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// 返回 date 当前或之后最近一次由逆行转为顺行的留时刻，结果保持 date 的时区。
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// Returns the nearest station at or after date where motion changes from retrograde to prograde, keeping date's time zone.
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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.NextJupiterRetrogradeToPrograde(jde), date.Location(), false)
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}
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// LastEasternQuadrature 上一次东方照 / previous eastern quadrature.
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//
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// 返回 date 当前或之前最近一次东方照时刻，结果保持 date 的时区。
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// Returns the nearest eastern quadrature at or before date, keeping date's time zone.
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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.LastJupiterEasternQuadrature(jde), date.Location(), false)
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}
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// NextEasternQuadrature 下一次东方照 / next eastern quadrature.
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//
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// 返回 date 当前或之后最近一次东方照时刻，结果保持 date 的时区。
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// Returns the nearest eastern quadrature at or after date, keeping date's time zone.
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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.NextJupiterEasternQuadrature(jde), date.Location(), false)
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}
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// LastWesternQuadrature 上一次西方照 / previous western quadrature.
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//
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// 返回 date 当前或之前最近一次西方照时刻，结果保持 date 的时区。
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// Returns the nearest western quadrature at or before date, keeping date's time zone.
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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.LastJupiterWesternQuadrature(jde), date.Location(), false)
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}
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// NextWesternQuadrature 下一次西方照 / next western quadrature.
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//
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// 返回 date 当前或之后最近一次西方照时刻，结果保持 date 的时区。
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// Returns the nearest western quadrature at or after date, keeping date's time zone.
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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.NextJupiterWesternQuadrature(jde), date.Location(), false)
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}
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