Method: When::TimeStandard::TemporalHourSystem#from_dynamical_time

Defined in:
lib/when_exe/timestandard.rb

#from_dynamical_time(time) ⇒ Numeric

dynamical time を temporal hour system に変換する

Parameters:

  • time (Numeric) —

    dynamical time

Returns:

  • (Numeric) —

    temporal hour system



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# File 'lib/when_exe/timestandard.rb', line 668

def from_dynamical_time(time)
  date = When::TM::JulianDate._t_to_d(time)

  d, t = [-1, +1].map {|v| @formula.day_event(date, v, When.Resource('_ep:Sun'), @height)}

  if    date < d # after midnight

    t = @formula.sunset(date-1, @height)
    f = (date - t) / (d - t) / 2 - 0.25

  elsif date > t # before midnight

    d = @formula.sunrise(date+1, @height)
    f = (date - t) / (d - t) / 2 - 0.25

  else           # day time

    f  = (date - d) / (t - d) / 2 + 0.25
  end

  When::TM::JulianDate._d_to_t(_from_dynamical_date(d).floor + 0.5 + f)
end