An ayanamsha is a degree of precession in Vedic astrology.

Vedic astrology has its authority in Hindu spirituality. It has been known for at least 5,000 years and is interconnected with all of Vedic thought.

The most important and immediately noticeable difference is that the planetary positions are different. While western astrology uses the actual observed position of the planets and the zodiac, Vedic astrology uses precession of the equinoxes, and that's why there will be a difference in the planetary positions, so your planets may be in an entirely different sign when you use the Vedic astrology system.

The second important difference is that while western astrology gives a lot of importance to Sun, Vedic astrology is based on Moon.

In Vedic astrology there is a special tool called the Dasha that is used to predict the events of a native's life while in western astrology we use Transits.

There is no such prediction in vedic astrology. Some people made some fantasy cinema and spread the rumor.

An ayanamsha is a degree of precession in Vedic Astrology.