33 lines
836 B
Go
33 lines
836 B
Go
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package earth
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import (
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"time"
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"b612.me/astro/basic"
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)
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// ApsisInfo 轨道极值事件 / orbital distance extremum event.
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type ApsisInfo struct {
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// Time 事件时刻，UTC / event time in UTC.
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Time time.Time
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// Distance 极值距离，单位 AU / extremum distance in AU.
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Distance float64
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}
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// Perihelion 指定年份的地球近日点 / Earth perihelion in the given year.
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func Perihelion(year int) ApsisInfo {
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return convertEarthApsisInfo(basic.EarthPerihelion(year))
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}
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// Aphelion 指定年份的地球远日点 / Earth aphelion in the given year.
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func Aphelion(year int) ApsisInfo {
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return convertEarthApsisInfo(basic.EarthAphelion(year))
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}
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func convertEarthApsisInfo(event basic.ApsisEvent) ApsisInfo {
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return ApsisInfo{
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Time: basic.JDE2DateByZone(event.JDE, time.UTC, false),
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Distance: event.Distance,
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}
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}
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