A 13th zodiac sign ?! ROFL !!

Earth's elliptical orbit around the sun can be divided into 12 different energy zones. People born under the influence of one particular energy zone tend to have similar characteristics and behavioral aspects. To distinguish the different set of personalities, they were identified with the constellation that portrayed their characteristics. For example, people born under the 7th energy level were mostly observed to be very diplomatic, these people keep a good balance in whatever they do in life. So they are identified by the constellation 'Libra' (The Scales).
Each constellation is just a portrayal of a set of people. The zodiac symbol is just a representation of the observed behavioral trend. It is the different energy levels which actually matter, not the zodiac symbol themselves. (If I mistake a Swedish person for a German, he/she will not speak German and behave like one. They will remain what they are, no matter what I think they are !! :) )
The 13th zodiac sign may cause change in the zodiac charts, with some really uneven distribution. Whatever it does (or doesn't), we will remain who we are and the world will go on as usual. Nothing is going to change.
PS: The sun signs don't tell the complete story of astrophysics. The Indian lunar system is a more complete and thorough system of astrology. More on that in another post. :)
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http://www.usvishakh.net/documents/astrology_and_science.pdf