So, if THERE ISN'T CUSPS SIGNS, WHY DON'T YOU FEEL LIKE YOUR SUN SIGN? Part 1. There is one more trick you have to know before you start to read traits of the people born between 19th and 25th in the month and that something you wouldn't realize unless you studied real Astrology, is that the Planet Mercury is always either in the same Sign as the Sun, or in the Sign on either side. Since Mercury is the Planet of "the Intellect" which indicates how you think and how you "communicate" (by talking or writing), and it can often be in the next or previous Sign from your Sun; this can explain why you may think you have some traits of that Sign as well as the traits of your Sun Sign. Venus, too, is always close to the Sun, and cannot be more than two Signs away from the Sun in anyone's horoscope. So if you were born when the Sun was near a Cusp, there is a good chance your Venus may be in the Sign adjacent to your Sun Sign, and be the reason you have some other traits that match that Sign. In either of these two common cases, those observed traits of the next or previous Sign are not the result of your Sun being "on the Cusp" at all - but because you have Mercury and/or Venus and/or other Planets (or the Ascendant) in the adjacent Sign. (This can occur even when your Sun is not near a Cusp line.)

via Madam Kighal's Astrology http://www.facebook.com/photo.php?fbid=556136564425732&set=a.271633452876046.64607.167278953311497&type=1