CREATE TABLE table_47005 ("Date" TEXT, "Visitor" TEXT, "Score" TEXT, "Home" TEXT, "Record" TEXT)

Who was the visitor on december 15, 1976?
SELECT "Visitor" FROM table_47005 WHERE "Date" = 'december 15, 1976'
SELECT "Visitor" FROM "table_47005" WHERE "Date" = 'december 15, 1976'