THE FREE-SPIRITED, ADVENTURE-OBSESSED, CAN'T-SIT-STILL SIGN OF THE ZODIAC. A Sagittarius is the ultimate realm to spontaneity. If you're born between November 22 and December 21, you're a Sagittarius - which means you're basically born to explore, philosophize, and maybe accidentally book a one-way ticket to somewhere random. Sagittarians are a fire sign ruled by Jupiter (like the planet of expansion), so expect them to be optimistic like they're on perpetual sunshine, freedom-loving like they're birds, and bluntly honest like they skipped the filter. Sagittarians = adventure + philosophy + probably a backpack full of maps.