By doing it under the constellation Ashlesha one begets heroic children. By doing it under the Maghas onc gains superiority over kinsmen.
आश्लेषायां ददच्छ्राद्धं धीरान् पुत्रान् प्रजायते। ज्ञातीनां तु भवेच्छ्रेष्ठो मघासु श्राद्धमावपन्॥