A horoscope, in its true meaning, is the construction of your birth chart which shows the exact location of planets in a preset format.
Horoscopes are cast on various different techniques in the Indian Vedic, western, Greek, Middle Eastern and Chinese system.
The India vedic system is by far the most accurate and sophisticated method.
How Indian Horoscope is Superior to other System
The birth chart cast on the Indian System is truly unique since the Indian system makes adjustments for the fact that our Zodiac / Universe is moving and not fixed ( by the Big Bang theory of creation of Universe - this system is following for more than 7000 years, proving ancient Indians had a great grasp of astronomy before any other civilization).
Also the Indian vedic system takes into account that the zodiac is elliptic and not circular due to which the twelve houses in a birth chart are not 30 degree each but varying according to the time of birth. Due to these differences the birth chart cast on the Indian system would come out different from that done on any other system AND much more accurate !
To QUOTE an example, there could be a chart cast on the western system with MOON in Sagittarius on 10 degree in the 9th house, making the person : WISE, WELL KNOWN, FRANK, OPEN MINDED, LUCKY, HAVING INTERNATIONAL REPUTE, HAPPY WITH REGARD TO MOTHER.
NOW, if the same birth details are used to construct the chart on the Indian vedic system, the MOON will fall in Scorpio 16th - 17th degree, 8th house, making the person petty, unhealthy, complexed, problems with mother, low on talent, insignificant and having a problematic married / love life.