Aarudh Lagna - Padd Lagna
Count the number of houses between the lord of ascendant and ascendant, count as many houses from where the lord of ascendant is placed upto the ascendant. The house which is obtained is called Aarurd ascendant and Padd ascendant. Let us assume, Aries is the ascendant and the lord of ascendant Mars is placed in the 4th house. Now the 4th from the 4th house is 7th house in which Aarurd Lagna is formed.