Many peope are puzzled by the difference between Western Tropical Astrology and Vedic Sidereal Astrology. Although both systems use the same 12 signs (Aries, Taurus, Gemini, etc.) modern calculations show a difference in the date ranges of the signs. For example, by the Tropical Zodiac, the month of Aries is approximately March 21 - April 20. The sidereal dates for Aries month are approximately April 14 - May 14.
This difference arises from a phenomenon called Precession of the Equinox.
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