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
111 lines
4.5 KiB
Go
111 lines
4.5 KiB
Go
package basic
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import (
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"math"
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. "b612.me/astro/tools"
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)
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func saturnRingSunLoBoWithInstance(jde float64, n int, node float64, inst *Instance) (lon, lat float64) {
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lon = PlanetCoordinateNWithInstance(5, 0, jde, n, inst)
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lat = PlanetCoordinateNWithInstance(5, 1, jde, n, inst)
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distance := PlanetCoordinateNWithInstance(5, 2, jde, n, inst)
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lat -= 0.000764 * Cos(lon-node) / distance
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lon -= 0.01759 / distance
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return lon, lat
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}
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func saturnRingParametersNWithInstance(jde float64, n int, inst *Instance) (earthLatitude, sunLatitude, positionAngle, deltaU, majorAxis, minorAxis float64) {
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inclination, node := saturnRingPlane(jde)
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earthLon, earthLat := SaturnApparentLoBoNWithInstance(jde, n, inst)
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sunLon, sunLat := saturnRingSunLoBoWithInstance(jde, n, node, inst)
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earthLatitude = saturnRingLatitude(inclination, node, earthLon, earthLat)
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sunLatitude = saturnRingLatitude(inclination, node, sunLon, sunLat)
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positionAngle = saturnRingPositionAngle(jde, inclination, node, earthLon, earthLat)
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earthU := saturnRingLongitude(inclination, node, earthLon, earthLat)
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sunU := saturnRingLongitude(inclination, node, sunLon, sunLat)
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deltaU = saturnRingLongitudeDelta(earthU, sunU)
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earthDistance := EarthSaturnAwayNWithInstance(jde, n, inst)
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majorAxis = 375.35 / earthDistance
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minorAxis = majorAxis * math.Abs(Sin(earthLatitude))
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return
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}
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func saturnRingParametersWithInstance(jde float64, inst *Instance) (earthLatitude, sunLatitude, positionAngle, deltaU, majorAxis, minorAxis float64) {
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return saturnRingParametersNWithInstance(jde, -1, inst)
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}
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// SaturnRingParametersWithInstance 土星环参数 / Saturn ring parameters with an explicit ephemeris instance.
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func SaturnRingParametersWithInstance(jde float64, inst *Instance) (earthLatitude, sunLatitude, positionAngle, deltaU, majorAxis, minorAxis float64) {
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if inst == nil {
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return SaturnRingParameters(jde)
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}
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return saturnRingParametersWithInstance(jde, inst)
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}
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// SaturnRingParametersNWithInstance 土星环参数（n 变体） / n-parameterised Saturn ring parameters with an explicit ephemeris instance.
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func SaturnRingParametersNWithInstance(jde float64, n int, inst *Instance) (earthLatitude, sunLatitude, positionAngle, deltaU, majorAxis, minorAxis float64) {
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if inst == nil {
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return SaturnRingParametersN(jde, n)
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}
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return saturnRingParametersNWithInstance(jde, n, inst)
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}
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// SaturnRingBWithInstance 土星环张角 / Saturn ring opening angle with an explicit ephemeris instance.
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func SaturnRingBWithInstance(jde float64, inst *Instance) float64 {
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if inst == nil {
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return SaturnRingB(jde)
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}
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earthLatitude, _, _, _, _, _ := saturnRingParametersWithInstance(jde, inst)
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return earthLatitude
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}
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// SaturnRingSunBWithInstance 土星环太阳侧张角 / Sun-side Saturn ring opening angle with an explicit ephemeris instance.
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func SaturnRingSunBWithInstance(jde float64, inst *Instance) float64 {
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if inst == nil {
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return SaturnRingSunB(jde)
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}
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_, sunLatitude, _, _, _, _ := saturnRingParametersWithInstance(jde, inst)
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return sunLatitude
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}
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// SaturnRingPositionAngleWithInstance 土星环位置角 / Saturn ring position angle with an explicit ephemeris instance.
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func SaturnRingPositionAngleWithInstance(jde float64, inst *Instance) float64 {
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if inst == nil {
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return SaturnRingPositionAngle(jde)
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}
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_, _, positionAngle, _, _, _ := saturnRingParametersWithInstance(jde, inst)
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return positionAngle
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}
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// SaturnRingDeltaUWithInstance 土星环面经度差 / Saturn ring-plane longitude difference with an explicit ephemeris instance.
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func SaturnRingDeltaUWithInstance(jde float64, inst *Instance) float64 {
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if inst == nil {
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return SaturnRingDeltaU(jde)
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}
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_, _, _, deltaU, _, _ := saturnRingParametersWithInstance(jde, inst)
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return deltaU
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}
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// SaturnRingAxisWithInstance 土星环外缘轴 / outer Saturn ring axes with an explicit ephemeris instance.
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func SaturnRingAxisWithInstance(jde float64, inst *Instance) (float64, float64) {
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if inst == nil {
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return SaturnRingAxis(jde)
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}
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_, _, _, _, majorAxis, minorAxis := saturnRingParametersWithInstance(jde, inst)
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return majorAxis, minorAxis
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}
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// SaturnMagWithInstance 土星视星等 / apparent magnitude of Saturn with an explicit ephemeris instance.
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func SaturnMagWithInstance(jde float64, inst *Instance) float64 {
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if inst == nil {
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return SaturnMag(jde)
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}
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awaySun := SaturnRWithInstance(jde, inst)
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awayEarth := EarthSaturnAwayWithInstance(jde, inst)
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ringB, _, _, deltaU, _, _ := saturnRingParametersWithInstance(jde, inst)
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ringB = math.Abs(ringB)
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mag := -8.68 + 5*math.Log10(awaySun*awayEarth) + 0.044*deltaU - 2.6*Sin(ringB) + 1.25*Sin(ringB)*Sin(ringB)
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return FloatRound(mag, 2)
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}
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