code: public static function J($year) {
      // Get JD of the epoch
      $jd = static::J2000()->jd + ($year - 2000) * static::DaysJulianYear;
  
      // Create and return new epoch
      $epoch       = new static($jd);
      $epoch->type = YearType::Julian();
      return $epoch;
    }
docs: Creates a new epoch from a Julian year number
  @param float $year Year number in Julian years