What makes Maha Bharani Shradh more powerful than other Pitrupaksha days?

Maha Bharani Shradh is performed when the Moon transits through Bharani Nakshatra — the nakshatra governed by Yama, the Lord of Death. This creates a direct cosmic alignment between the ritual, the deity (Yama) who governs the ancestral realm, and the consciousness of the departed souls. The Dharmasindhu explicitly states that this alignment produces merit equal to Gaya Pind Daan — the most powerful ancestral rite in Hinduism. No other single day in Pitrupaksha carries this scriptural guarantee.