b612
044f2f4381
- 新增半解析、旧模型、自定义与多源堆叠星历实例，提供 Context、Instance、SPK 读取及状态与视位置计算 - 统一太阳、月球和行星实例接口，扩展黄经穿越、留、相位、最近角距、偕日可见、任意高度升落、轨道节点及凌日等天象查询 - 完善日月食、月掩与凌日的月缘剖面、有限盘面接触、站心修正、局地可见性、全球路径和地图输出 - 新增 SVG、GeoJSON、KML 天象输出及凌日、月掩和月缘地形相关缓存与几何求解 - 新增恒星星表导入与查询，支持 CSV、Hipparcos、BSC5、Stellarium 等格式及名称、交叉标识、锥面检索和星等过滤 - 补充 IAU 2006、地球定向、折射消光、大气观测、轨道传播及半解析行星/月球数据支持 - 将默认未来民用时标切换为 TimeScaleLeapHour，更新 2027–2400 农历速查表、中文日期解析和时区边界处理 - 增加事件基线、跨模型回归、几何边界、月缘地形和输出契约测试，完善中英文手册、示例资源、NOTICE 与忽略规则
230 lines
9.5 KiB
Go
230 lines
9.5 KiB
Go
package saturn
|
|
|
|
import (
|
|
"errors"
|
|
"time"
|
|
|
|
"b612.me/astro/basic"
|
|
"b612.me/astro/calendar"
|
|
)
|
|
|
|
var (
|
|
ERR_SATURN_NEVER_RISE = errors.New("ERROR:极夜，土星今日永远在地平线下！")
|
|
ERR_SATURN_NEVER_SET = errors.New("ERROR:极昼，土星今日永远在地平线上！")
|
|
// ERR_SATURN_NEVER_DOWN deprecated: -- use ERR_SATURN_NEVER_SET instead
|
|
ERR_SATURN_NEVER_DOWN = ERR_SATURN_NEVER_SET
|
|
)
|
|
|
|
func riseSetResult(date time.Time, jd float64, err error) (time.Time, error) {
|
|
if err != nil {
|
|
switch {
|
|
case errors.Is(err, basic.ErrNeverRise):
|
|
return time.Time{}, ERR_SATURN_NEVER_RISE
|
|
case errors.Is(err, basic.ErrNeverSet):
|
|
return time.Time{}, ERR_SATURN_NEVER_SET
|
|
default:
|
|
return time.Time{}, err
|
|
}
|
|
}
|
|
_, offset := date.Zone()
|
|
return basic.JD2DateByZone(jd-float64(offset)/86400, date.Location(), false), nil
|
|
}
|
|
|
|
// ApparentLo 视黄经 / apparent ecliptic longitude.
|
|
func (module *Saturn) ApparentLo(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.SaturnApparentLoWithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// ApparentBo 视黄纬 / apparent ecliptic latitude.
|
|
func (module *Saturn) ApparentBo(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.SaturnApparentBoWithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// ApparentRa 视赤经 / apparent right ascension.
|
|
func (module *Saturn) ApparentRa(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.SaturnApparentRaWithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// ApparentDec 视赤纬 / apparent declination.
|
|
func (module *Saturn) ApparentDec(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.SaturnApparentDecWithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// ApparentRaDec 视赤经、视赤纬 / apparent right ascension and declination.
|
|
func (module *Saturn) ApparentRaDec(date time.Time) (float64, float64) {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.SaturnApparentRaDecWithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// ApparentMagnitude 视星等 / apparent magnitude.
|
|
func (module *Saturn) ApparentMagnitude(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.SaturnMagWithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// EarthDistance 地心距离 / Earth distance.
|
|
func (module *Saturn) EarthDistance(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.EarthSaturnAwayWithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// SunDistance 日心距离 / Sun distance.
|
|
func (module *Saturn) SunDistance(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.PlanetCoordinateWithInstance(5, 2, basic.UTC2TT(jd), module.inst)
|
|
}
|
|
|
|
// Altitude 站心视高度角，不含大气折射 / topocentric apparent altitude without refraction.
|
|
func (module *Saturn) Altitude(date time.Time, lon, lat float64) float64 {
|
|
localJD := basic.Date2JD(date)
|
|
_, loc := date.Zone()
|
|
timezone := float64(loc) / 3600.0
|
|
return basic.SaturnHeightWithInstance(localJD, lon, lat, timezone, module.inst)
|
|
}
|
|
|
|
// Zenith 天顶距 / zenith distance.
|
|
func (module *Saturn) Zenith(date time.Time, lon, lat float64) float64 {
|
|
return 90 - module.Altitude(date, lon, lat)
|
|
}
|
|
|
|
// Azimuth 站心方位角 / topocentric azimuth.
|
|
func (module *Saturn) Azimuth(date time.Time, lon, lat float64) float64 {
|
|
localJD := basic.Date2JD(date)
|
|
_, loc := date.Zone()
|
|
timezone := float64(loc) / 3600.0
|
|
return basic.SaturnAzimuthWithInstance(localJD, lon, lat, timezone, module.inst)
|
|
}
|
|
|
|
// HourAngle 地心视时角，不含站心视差 / geocentric apparent hour angle without topocentric parallax.
|
|
func (module *Saturn) HourAngle(date time.Time, lon float64) float64 {
|
|
localJD := basic.Date2JD(date)
|
|
_, loc := date.Zone()
|
|
timezone := float64(loc) / 3600.0
|
|
return basic.SaturnHourAngleWithInstance(localJD, lon, timezone, module.inst)
|
|
}
|
|
|
|
// CulminationTime 中天时刻 / culmination time.
|
|
func (module *Saturn) CulminationTime(date time.Time, lon float64) time.Time {
|
|
date = time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
|
|
localJD := basic.Date2JD(date)
|
|
_, loc := date.Zone()
|
|
timezone := float64(loc) / 3600.0
|
|
calcJD := basic.SaturnCulminationTimeWithInstance(localJD, lon, timezone, module.inst) - timezone/24.00
|
|
return basic.JD2DateByZone(calcJD, date.Location(), false)
|
|
}
|
|
|
|
// RiseTime 升起时间 / rise time.
|
|
func (module *Saturn) RiseTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
|
|
var aeroFloat float64
|
|
if aero {
|
|
aeroFloat = 1
|
|
}
|
|
date = time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
|
|
localJD := basic.Date2JD(date)
|
|
_, loc := date.Zone()
|
|
timezone := float64(loc) / 3600.0
|
|
riseJD, err := basic.SaturnRiseTimeWithInstance(localJD, lon, lat, timezone, aeroFloat, height, module.inst)
|
|
return riseSetResult(date, riseJD, err)
|
|
}
|
|
|
|
// DownTime 落下时间别名 / deprecated set-time alias.
|
|
func (module *Saturn) DownTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
|
|
return module.SetTime(date, lon, lat, height, aero)
|
|
}
|
|
|
|
// SetTime 落下时间 / set time.
|
|
func (module *Saturn) SetTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
|
|
var aeroFloat float64
|
|
if aero {
|
|
aeroFloat = 1
|
|
}
|
|
date = time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
|
|
localJD := basic.Date2JD(date)
|
|
_, loc := date.Zone()
|
|
timezone := float64(loc) / 3600.0
|
|
riseJD, err := basic.SaturnSetTimeWithInstance(localJD, lon, lat, timezone, aeroFloat, height, module.inst)
|
|
return riseSetResult(date, riseJD, err)
|
|
}
|
|
|
|
// LastConjunction 上一次合日 / previous conjunction with the Sun.
|
|
func (module *Saturn) LastConjunction(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.LastSaturnConjunctionWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// NextConjunction 下一次合日 / next conjunction with the Sun.
|
|
func (module *Saturn) NextConjunction(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.NextSaturnConjunctionWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// LastOpposition 上一次冲日 / previous opposition.
|
|
func (module *Saturn) LastOpposition(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.LastSaturnOppositionWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// NextOpposition 下一次冲日 / next opposition.
|
|
func (module *Saturn) NextOpposition(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.NextSaturnOppositionWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// LastProgradeToRetrograde 上一次顺行转逆行留 / previous station from prograde to retrograde.
|
|
func (module *Saturn) LastProgradeToRetrograde(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.LastSaturnProgradeToRetrogradeWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// NextProgradeToRetrograde 下一次顺行转逆行留 / next station from prograde to retrograde.
|
|
func (module *Saturn) NextProgradeToRetrograde(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.NextSaturnProgradeToRetrogradeWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// LastRetrogradeToPrograde 上一次逆行转顺行留 / previous station from retrograde to prograde.
|
|
func (module *Saturn) LastRetrogradeToPrograde(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.LastSaturnRetrogradeToProgradeWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// NextRetrogradeToPrograde 下一次逆行转顺行留 / next station from retrograde to prograde.
|
|
func (module *Saturn) NextRetrogradeToPrograde(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.NextSaturnRetrogradeToProgradeWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// LastEasternQuadrature 上一次东方照 / previous eastern quadrature.
|
|
func (module *Saturn) LastEasternQuadrature(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.LastSaturnEasternQuadratureWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// NextEasternQuadrature 下一次东方照 / next eastern quadrature.
|
|
func (module *Saturn) NextEasternQuadrature(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.NextSaturnEasternQuadratureWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// LastWesternQuadrature 上一次西方照 / previous western quadrature.
|
|
func (module *Saturn) LastWesternQuadrature(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.LastSaturnWesternQuadratureWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// NextWesternQuadrature 下一次西方照 / next western quadrature.
|
|
func (module *Saturn) NextWesternQuadrature(date time.Time) time.Time {
|
|
jde := basic.UTC2TT(basic.Date2JD(date.UTC()))
|
|
return basic.JD2DateByZone(basic.NextSaturnWesternQuadratureWithInstance(jde, module.inst), date.Location(), false)
|
|
}
|
|
|
|
// ApparentMagnitude2018 视星等（Mallama & Hilton 2018 模型）/ apparent magnitude, Mallama & Hilton 2018 model.
|
|
func (module *Saturn) ApparentMagnitude2018(date time.Time) float64 {
|
|
jd := calendar.Date2JD(date.UTC())
|
|
return basic.SaturnMag2018WithInstance(basic.UTC2TT(jd), module.inst)
|
|
}
|