Common Janma Nakshatra: MOOLA
This is a further extension of the principle of common Janma Rasi. The Janma Nakshatras of the bride and bridegroom, being one and the same, are approved in case of Rohini, Aridra, Makha, Hasta, Visakha, Sravana. Uttarabhadra and Revati. The effect would be ordinary if the common Janma Nakshatras are Aswini, Krittika, Mrigasira, Punarvasu, Pushya, Pubba. Uttara. Chitta, Anuradha, Poorvashadha and Uttarashadha, Bharani, Aslesha. Common Janma Nakshatras is not recommended if the Nakshatras happens to be Swati, Jyeshta, Moola, Dhanishta, Satabhisha and Poorvabhadra .
Here again certain ancient authors hold that even though the Janma Nakshatras are same, the evil becomes nullified if the Padas are different. If the Janma Nakshatra belongs to two signs (e.g., Krittika) the Pada of the bride should relate to the preceding sign. For example, if Krittika is the common Janma Nakshatra, the bride should have her Janma Rasi in Mesha and the bridegroom in Vrishabha. If, however, the common Janma Nakshatra belongs to two signs equally (e.g., Mrigasira, Chitta, etc.) the sign for the first two quarters should be that of the bridegroom.
The couple should not have the same Janma Rasi, same Janma Nakshatra and Pada. However, in regard to Satabhisha, Hasta, Swati. Aswini, Krittika, Poorvashadha, Mrigasira and Makha, the evil given rise to by virtue of common Janma Rasi, Nakshatra and Pada gets cancelled if the couple are born in the first quarter.
Certain parts of Moola, Astesha, Jyeshta and Visakha are destructive constellations
§ Moola (first quarter) for husband's father
§ Aslesha (first quarter) for husband's mother
§ Jyeshta (first quarter) for girl's husband's elder brother
§ Visakha (last quarter) for husband's younger brother.
As indicated above, Though the stars belong to Moola, if the Pada (Legs) are in different houses, Marriages can be accepted. However I personally feel it is not advisable to go ahead.