Full Aspect in Lal Kitab
Full aspect means 100% aspect. The first house aspects the seventh house by its full aspect, the fourth house aspects the tenth house by its 100% aspect and the eighth house aspects the second house by its full aspect. Planet which aspects by full aspect will totally influence another planet.
Half Aspect in Lal Kitab
Half aspect means 50% aspect of planet. The third house aspects the ninth and eleventh house by its half aspect. Similarly the fifth house aspects the ninth house by its half aspect. In this situation planet will have its half influence on another planet.
One-Quarter Aspect in Lal Kitab
One-quarter aspect means 25% aspect. The second house aspects the sixth house by its one-quarter aspect. The sixth house aspects the twelfth house by its one-quarter aspect and the eighth house aspects the twelfth house by its one-quarter aspect. If a planet aspects by its one-quarter aspect, then it will give its one-fourth influence to another planet.
In Vedic astrology, there are some exceptions for aspects of planets. For example, if Mercury is placed in the twelfth house, then it will influence the sixth house and if Mercury is placed in the ninth house, then it will influence the third house. If Saturn is located in the sixth house, then it will influence the second house.