Why is Dallas, Texas chosen as the location for the assassination of the President in the novel, The Tears of Autumn?

The site of President John F. Kennedy' assassination on 22 Nov 1963, Dallas is carefully selected through feng shui, the ancient Asian practice of "geomancy," which determines how good and evil forces act on human beings. It is vital that the fatal shots not be fired in a northerly or northeasterly direction, which are considered unlucky. Lee Harvey Oswald fires almost directly due west. The optimal date for JFK to die violently is selected by horoscopy. He happens to be visiting Dallas on the propitious 21st day after the death of South Vietnamese President Ngo Dinh Diem.