public function isAquarius()
    {
        return ($this->month === self::MONTH_JANUARY) && ($this->day >= 21) && ($this->day <= 30) || ($this->month === self::MONTH_FEBRUARY) && ($this->day <= 19);
    }
public function isAquarius()
    {
        return ($this->month === self::MONTH_JANUARY) && ($this->day >= 21) && ($this->day <= 30) || ($this->month === self::MONTH_FEBRUARY) && ($this->day <= 19);
    }
public function isAquarius ( ) { return ( $ this -> month === self :: MONTH_JANUARY ) && ( $ this -> day >= 21 ) && ( $ this -> day <= 30 ) || ( $ this -> month === self :: MONTH_FEBRUARY ) && ( $ this -> day <= 19 ) ; }
Checks whether the sign is Aquarius

@return boolean
Checks whether the sign is Aquarius