Basically, Astrology is an incomparable asset to assess the potential possibilities of our lives. Western Astrology is relatively new as compared to Vedic Astrology, as the latter has been practised for thousands of years, having written documents in the Vedas as well.
As the name suggests, the origin of Vedic Astrology can be traced to the Vedas, the foremost scriptures on planet Earth. Vedic Astrology was developed by the ancient seers and sages (Rishis) of the Indian Subcontinent, thousands of years ago. Thus, Vedic Astrology is pious and antique and believed to be the word of God passed on to the wise people in the past.
On the other hand, Western Astrology can be traced back to life and intellectual development in ancient Greece. Western Astrology is also influenced by the Egyptian Civilisation. Thus, Western Astrology is an outcome of the evolved intellectuality and exploration of the European mind.
2. Astrological Calculations
The Vedic Astrology system is about a fixed zodiac, with a certain Nakshatra (Planet) in the background. It is also called “Sidereal Zodiac”. The Sidereal year is the time taken by earth to revolve around Sun with respect to the fixed star Chitra, and this duration is apparently 20 minutes longer than the tropical year.
As for Western Astrology, it works on a movable zodiac. This system is based on the orientation of Earth to Sun. It is also known as “Tropical Zodiac”.
In the Vedic Astrology, there are total of 9 Planets: Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn and Rahu-Ketu, the two nodes of the Moon. Also, while using the 12 signs, Vedic Astrology makes use of 27 lunar constellations, called Nakshatras, each one covering a span of 13 degrees and 20 minutes.
Western Astrology includes planets like Uranus, Neptune, and Pluto to predict future, which is not considered by Vedic Astrology. Besides, Western Astrology does not consider Nakshatras or constellations.
4. Time System
Vedic Astrology applies Vimshotarri Dasha system (a method to time the planetary system) while analyzing the planetary transits for future events.
Western Astrology does not use Dasha System. On the other hand, it studies planetary transits based on their advances and movements.
5. Solar and Lunar System
Western Astrology seems to rely more upon the movement and placement of Sun. So, the emphasis is more on psychology, the personality an, character of an individual.On the other hand, the Vedic or Sidereal system is a Moon-based astrology system which covers all the areas of life.