src

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git clone git://code.dwrz.net/src
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julian.go (452B)

      1 package sunrise
      2 
      3 import (
      4 	"time"
      5 )
      6 
      7 const (
      8 	secondsInADay      = 86400
      9 	unixEpochJulianDay = 2440587.5
     10 )
     11 
     12 // TimeToJulianDay converts a time.Time into a Julian day.
     13 func TimeToJulianDay(t time.Time) float64 {
     14 	return float64(t.Unix())/secondsInADay + unixEpochJulianDay
     15 }
     16 
     17 // JulianDayToTime converts a Julian day into a time.Time.
     18 func JulianDayToTime(d float64) time.Time {
     19 	return time.Unix(int64((d-unixEpochJulianDay)*secondsInADay), 0).UTC()
     20 }