Class: When::Ephemeris::UniversalTime

from_dynamical_time(time) click to toggle source

dynamical time を universal time に変換する

  time    : dynamical time(Numeric)
  returns : universal time(Numeric)

      # File when/ephemeris.rb, line 1231
1231:     def from_dynamical_time(time)
1232:       return time unless -Float::MAX/4 < time && time < Float::MAX/4
1233:       jd_tt = time / When::TM::IntervalLength::DAY + When::TM::JulianDate::JD19700101 - 0.5
1234:       utc   = time - self.class.delta_t(jd_tt) * When::TM::IntervalLength::SECOND
1235:       diff  = time - to_dynamical_time(utc)
1236:       return utc if diff == 0 # 間に閏秒なし
1237:       utc  += diff
1238:       diff  = time - to_dynamical_time(utc)
1239:       return utc if diff == 0 # 間に閏秒なし
1240:       return When::Coordinates::LeapSeconds.new(utc+diff, -diff, When::TM::IntervalLength::SECOND)
1241:     end

leap?() click to toggle source

当該時刻系に閏秒があるか?

  returns : true - 閏秒あり

      # File when/ephemeris.rb, line 1257
1257:     def leap?
1258:       true
1259:     end

now() click to toggle source

現在日時を universal time で返す

  returns : universal time(Numeric)

      # File when/ephemeris.rb, line 1247
1247:     def now
1248:       result = Time.now.to_f * When::TM::IntervalLength::SECOND
1249:       return result if self.class._ignore_leap?
1250:       from_dynamical_time(result + self.class.DeltaT0 * When::TM::IntervalLength::SECOND)
1251:     end

to_dynamical_time(time) click to toggle source

universal time を dynamical time に変換する

  time    : universal time(Numeric)
  returns : dynamical time(Numeric)

      # File when/ephemeris.rb, line 1220
1220:     def to_dynamical_time(time)
1221:       return time unless -Float::MAX/4 < time && time < Float::MAX/4
1222:       jd_utc = (time * 1) / When::TM::IntervalLength::DAY + When::TM::JulianDate::JD19700101 - 0.5
1223:       +time + self.class.delta_t(jd_utc) * When::TM::IntervalLength::SECOND
1224:     end

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