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It is possible to draw up a chart without a birth time and still get good results.
One method is to place the sign and degree of the Sun on the ascendant. This is called a Solar Chart. This method is used to produce the "sun sign horoscopes" you see in magazines and newspapers.
Or you can use a "flat chart". This is a chart that starts with 0 degrees of Aries on the ascendant. Then you go round the wheel placing the planets in their degrees and signs.