As a Sagittarius born on December 9th, your assertiveness and openness are amongst your most well known qualities. You are forceful and confident in all your dealings, which helps you get the very best out of life. You are very clear when there is something you want or desire and you are not afraid to let others know your true feelings. This open, honest nature is one of your greatest assets, although your family and friends may not always appreciate your frank way of communicating.