Yes, it is possible to check Rasi Athipathi Porutham if the Rasi (zodiac sign) of the bride and groom is already known. The Rasi is usually found from the birth star or horoscope, but if someone already knows their Rasi, the matching can be checked directly.

For example, if the bride’s Rasi is Mesha (Aries) ruled by Mars, and the groom’s Rasi is Simha (Leo) ruled by the Sun, the relationship between these planets can be used to check the porutham.