How to make my if statements run again as if-else statement runs?

Currently if someone inputs a date that is out of bounds it will result in the else statement running which is all fine and dandy, but I would like it so if-else statement were to run, it would rerun the if statements. I don't really have a solid idea on what I should do so any help would be appreciated!

import java.util.Scanner;

public class Horoscope {
    public Horoscope() {
        Scanner sc = new Scanner(System.in);
        String output = "Please enter a valid date";
        int month;
        int day;

        System.out.println("What is your month of birth?");
        month = sc.nextInt();
        System.out.println("What is your day of birth?");
        day = sc.nextInt();

        if((month == 3 && day >= 20 && day <= 31) || (month == 4 && day >= 1 && day <= 19)) {
            System.out.println("You are an Aries");
        }
        else if((month == 4 && day >= 20 && day <= 30) || (month == 5 && day >= 1 && day <= 20)) {
            System.out.println("You are a Taurus");
        }
        else if((month == 5 && day >= 21 && day <= 31) || (month == 6 && day >= 1 && day <= 20)) {
            System.out.println("You are a Gemini");
        }
        else if((month == 6 && day >= 21 && day <= 30) || (month == 7 && day >= 1 && day <= 22)) {
            System.out.println("You are a Cancer");
        }
        else if((month == 7 && day >= 23 && day <= 31) || (month == 8 && day >= 1 && day <= 22)) {
            System.out.println("You are a Leo");
        }
        else if((month == 8 && day >= 23 && day <= 31) || (month == 9 && day >= 1 && day <= 22)) {
            System.out.println("You are a Virgo");
        }
        else if((month == 9 && day >= 23 && day <= 30) || (month == 10 && day >= 1 && day <= 22)) {
            System.out.println("You are a Libra");
        }
        else if((month == 10 && day >= 23 && day <= 30) || (month == 11 && day >= 1 && day <= 21)) {
            System.out.println("You are a Scorpio");
        }
        else if((month == 11 && day >= 22 && day <= 31) || (month == 12 && day >= 1 && day <= 21)) {
            System.out.println("You are a Sagittarius");
        }
        else if((month == 12 && day >= 22 && day <= 31) || (month == 1 && day >= 1 && day <= 19)) {
            System.out.println("You are a Capricorn");
        }
        else if((month == 1 && day >= 20 && day <= 31) || (month == 2 && day >= 1 && day <= 18)) {
            System.out.println("You are an Aquarius");
        }
        else if((month == 2 && day >= 19 && day <= 29) || (month == 3 && day >= 1 && day <= 20)) {
            System.out.println("You are a Pisces");
        }
        else {
        System.out.println(output);
        }
    }
}