37 lines
1.0 KiB
Go
37 lines
1.0 KiB
Go
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package moon
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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 km / extremum distance in km.
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Distance float64
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}
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// PerigeesInMonth 指定年月内的所有月球近地点 / all lunar perigees in the given Gregorian month.
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func PerigeesInMonth(year int, month time.Month) []ApsisInfo {
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return convertMoonApsisInfos(basic.MoonPerigees(year, month))
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}
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// ApogeesInMonth 指定年月内的所有月球远地点 / all lunar apogees in the given Gregorian month.
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func ApogeesInMonth(year int, month time.Month) []ApsisInfo {
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return convertMoonApsisInfos(basic.MoonApogees(year, month))
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}
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func convertMoonApsisInfos(events []basic.ApsisEvent) []ApsisInfo {
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result := make([]ApsisInfo, 0, len(events))
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for _, event := range events {
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result = append(result, 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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return result
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}
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