Maimonides Minute – Hilchot Shofar 2:7-8 (Special rules for Jerusalem)

Although blowing shofar on Shabbat or Yom Tov is generally prohibited by rabbinic decree (excepting Rosh Hashanah that is not Shabbat for the sake of the mitzvah itself), must we stop children who are blowing the shofar on Shabbat from doing so? What are the special parameters for blowing the shofar in Jerusalem? And how is “Jerusalem” defined?