class World
  def self.time_of_day
    hour = Time.current.hour
    if [2, 14].include? hour
      :firstlight
    elsif (hour >= 3 && hour < 8) || (hour >= 15 && hour < 20)
      :day
    elsif [8, 20].include? hour
      :twilight
    else
      :night
    end
  end
end