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How to guess someone's astrological sign
Learn the basics about astrological personality traits.
Study the different traits that are usually attributed to each sign. An easy way to remember these traits is to think about people that you know in each sign.
Think about how they do or don't fit into the categorization of their sign. The more you compare people you know to the descriptions of their signs, the easier it will be to keep an idea in mind about what each sign is like.