starainrt
3ffdbe0034
- 新增日食、月食、本地可见性、中心线、半影区域、SVG 图示与沙罗周期信息 - 新增行星冲合、留、方照、物理星历、视直径、相位、亮肢角、轨道节点等计算 - 新增木星伽利略卫星位置、现象与接触事件计算 - 新增恒星星表、星座判定、自行修正与观测辅助能力 - 新增 coord、formula、orbit、sundial、lite/sun、lite/moon 等扩展包 - 完善农历年号、月相英文别名、视差角、大气质量、折射、日晷与双星计算 - 增加 NASA、JPL Horizons、IMCCE 等回归测试数据与基线测试 - 重构基础算法文件组织，补充大量公开 API 注释和语义回归测试 - 更新中文和英文 README，补充示例、精度说明、SVG 配图
369 lines
17 KiB
Go
369 lines
17 KiB
Go
package mercury
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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_MERCURY_NEVER_RISE = errors.New("ERROR:极夜，水星今日永远在地平线下！")
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ERR_MERCURY_NEVER_SET = errors.New("ERROR:极昼，水星今日永远在地平线上！")
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// ERR_MERCURY_NEVER_DOWN deprecated: -- use ERR_MERCURY_NEVER_SET instead
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ERR_MERCURY_NEVER_DOWN = ERR_MERCURY_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_MERCURY_NEVER_RISE
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case errors.Is(err, basic.ErrNeverSet):
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return time.Time{}, ERR_MERCURY_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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// 返回水星在 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 Mercury 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.MercuryApparentLo(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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// 返回水星在 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 Mercury 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.MercuryApparentBo(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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// 返回水星在 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 Mercury 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.MercuryApparentRa(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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// 返回水星在 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 Mercury 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.MercuryApparentDec(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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// 返回水星在 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 Mercury 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.MercuryApparentRaDec(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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// 返回水星在 date 对应绝对时刻的视星等。
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// Returns the apparent visual magnitude of Mercury 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.MercuryMag(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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// 返回水星在 date 对应绝对时刻到地球的距离，单位 AU。
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// Returns the distance from Mercury 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.EarthMercuryAway(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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// 返回水星在 date 对应绝对时刻到太阳的距离，单位 AU。
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// Returns the distance from Mercury 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(1, 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.MercuryHeight(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.MercuryAzimuth(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.MercuryHourAngle(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.MercuryCulminationTime(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.MercuryRiseTime(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.MercurySetTime(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 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 most recent conjunction with the Sun relative to 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.LastMercuryConjunction(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 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 next conjunction with the Sun relative to 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.NextMercuryConjunction(jde), date.Location(), false)
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}
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// LastInferiorConjunction 上一次下合 / previous inferior conjunction.
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//
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// 返回 date 之前最近一次下合时刻，结果保持 date 的时区。
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// Returns the most recent inferior conjunction relative to date, keeping date's time zone.
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func LastInferiorConjunction(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.LastMercuryInferiorConjunction(jde), date.Location(), false)
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}
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// NextInferiorConjunction 下一次下合 / next inferior conjunction.
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//
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// 返回 date 之后最近一次下合时刻，结果保持 date 的时区。
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// Returns the next inferior conjunction relative to date, keeping date's time zone.
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func NextInferiorConjunction(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.NextMercuryInferiorConjunction(jde), date.Location(), false)
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}
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// LastSuperiorConjunction 上一次上合 / previous superior conjunction.
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//
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// 返回 date 之前最近一次上合时刻，结果保持 date 的时区。
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// Returns the most recent superior conjunction relative to date, keeping date's time zone.
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func LastSuperiorConjunction(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.LastMercurySuperiorConjunction(jde), date.Location(), false)
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}
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// NextSuperiorConjunction 下一次上合 / next superior conjunction.
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//
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// 返回 date 之后最近一次上合时刻，结果保持 date 的时区。
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// Returns the next superior conjunction relative to date, keeping date's time zone.
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func NextSuperiorConjunction(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.NextMercurySuperiorConjunction(jde), date.Location(), false)
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}
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// LastRetrograde 上一次留 / previous stationary point.
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//
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// 返回 date 之前最近一次留时刻，不区分顺转逆还是逆转顺，结果保持 date 的时区。
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// Returns the most recent stationary point relative to date without distinguishing direction, keeping date's time zone.
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func LastRetrograde(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.LastMercuryRetrograde(jde), date.Location(), false)
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}
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// NextRetrograde 下一次留 / next stationary point.
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//
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// 返回 date 之后最近一次留时刻，不区分顺转逆还是逆转顺，结果保持 date 的时区。
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// Returns the next stationary point relative to date without distinguishing direction, keeping date's time zone.
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func NextRetrograde(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.NextMercuryRetrograde(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 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 most recent stationary point where motion changes from prograde to retrograde relative to date, 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.LastMercuryProgradeToRetrograde(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 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 next stationary point where motion changes from prograde to retrograde relative to date, 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.NextMercuryProgradeToRetrograde(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 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 most recent stationary point where motion changes from retrograde to prograde relative to date, 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.LastMercuryRetrogradeToPrograde(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 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 next stationary point where motion changes from retrograde to prograde relative to date, 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.NextMercuryRetrogradeToPrograde(jde), date.Location(), false)
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}
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// LastGreatestElongation 上一次大距 / previous greatest elongation.
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//
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// 返回 date 之前最近一次大距时刻，不区分东西大距，结果保持 date 的时区。
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// Returns the most recent greatest elongation relative to date without distinguishing east or west, keeping date's time zone.
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func LastGreatestElongation(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.LastMercuryGreatestElongation(jde), date.Location(), false)
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}
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// NextGreatestElongation 下一次大距 / next greatest elongation.
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//
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// 返回 date 之后最近一次大距时刻，不区分东西大距，结果保持 date 的时区。
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// Returns the next greatest elongation relative to date without distinguishing east or west, keeping date's time zone.
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func NextGreatestElongation(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.NextMercuryGreatestElongation(jde), date.Location(), false)
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}
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// LastGreatestElongationEast 上一次东大距 / previous greatest eastern elongation.
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//
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// 返回 date 之前最近一次东大距时刻，结果保持 date 的时区。
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// Returns the most recent greatest eastern elongation relative to date, keeping date's time zone.
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func LastGreatestElongationEast(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.LastMercuryGreatestElongationEast(jde), date.Location(), false)
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}
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// NextGreatestElongationEast 下一次东大距 / next greatest eastern elongation.
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//
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// 返回 date 之后最近一次东大距时刻，结果保持 date 的时区。
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// Returns the next greatest eastern elongation relative to date, keeping date's time zone.
|
||
func NextGreatestElongationEast(date time.Time) time.Time {
|
||
jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
|
||
return basic.JDE2DateByZone(basic.NextMercuryGreatestElongationEast(jde), date.Location(), false)
|
||
}
|
||
|
||
// LastGreatestElongationWest 上一次西大距 / previous greatest western elongation.
|
||
//
|
||
// 返回 date 之前最近一次西大距时刻，结果保持 date 的时区。
|
||
// Returns the most recent greatest western elongation relative to date, keeping date's time zone.
|
||
func LastGreatestElongationWest(date time.Time) time.Time {
|
||
jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
|
||
return basic.JDE2DateByZone(basic.LastMercuryGreatestElongationWest(jde), date.Location(), false)
|
||
}
|
||
|
||
// NextGreatestElongationWest 下一次西大距 / next greatest western elongation.
|
||
//
|
||
// 返回 date 之后最近一次西大距时刻，结果保持 date 的时区。
|
||
// Returns the next greatest western elongation relative to date, keeping date's time zone.
|
||
func NextGreatestElongationWest(date time.Time) time.Time {
|
||
jde := basic.TD2UT(basic.Date2JDE(date.UTC()), true)
|
||
return basic.JDE2DateByZone(basic.NextMercuryGreatestElongationWest(jde), date.Location(), false)
|
||
}
|