36 lines
1.2 KiB
Go
36 lines
1.2 KiB
Go
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package basic
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import (
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"b612.me/astro/internal/ephem"
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)
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// Instance 显式只读星历实例 / explicit read-only ephemeris instance.
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type Instance = ephem.Instance
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// EphemerisModel 几何位置所用的星历模型 / ephemeris model behind geometric positions.
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type EphemerisModel int
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const (
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// EphemerisLegacy VSOP87 + ELP2000 截断级数，astro_legacy 构建下为默认 / truncated VSOP87 and ELP2000 series, default under astro_legacy.
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EphemerisLegacy EphemerisModel = iota
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// EphemerisSemianalytic VSOP2013/TOP2013 + ELP/MPP02 结构、按 DE441 重拟的半解析表 / semi-analytic tables refitted to DE441.
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EphemerisSemianalytic
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)
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// SetEphemerisModel 切换全局星历模型，未知值返回 false / switches the global ephemeris model; unknown values return false.
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func SetEphemerisModel(m EphemerisModel) bool {
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if m != EphemerisLegacy && m != EphemerisSemianalytic {
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return false
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}
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// 依赖星历的缓存都按 ΔT 世代校验，切换时一并递增。
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deltaTFnMu.Lock()
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if ephem.SetActive(ephem.Model(m)) {
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deltaTGeneration++
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}
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deltaTFnMu.Unlock()
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return true
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}
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// GetEphemerisModel 当前星历模型 / the active ephemeris model.
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func GetEphemerisModel() EphemerisModel { return EphemerisModel(ephem.Active()) }
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