Your first name of Sidonia gives you a poised, gracious, and reserved nature. Your analytical qualities make you a good business head, capable and clever, and you could gravitate to executive, managerial, or accounting positions. You prefer positions where your independence and love of freedom are not curtailed, where there is not the constant demands of people. It is not easy for you to be expressive, especially when you feel deeply about something. You are not spontaneous nor adaptable to situations where there are constant interruptions. As you do not like to be taken for granted, you can be somewhat stubborn and unbending when you feel misunderstood. You respect nature and the grandeur of the universe. Your feelings are better expressed through writing. Any weaknesses in health tends to affect the heart and respiratory organs or the female organs. Impromptu expression does not come easily unless you know your subject very well.