How is Kartik Poornima connected to Pitrupaksha ancestral rituals?

While Pitrupaksha (the fortnight in Bhadrapada) is the primary period for ancestral rites, Kartik Poornima carries a secondary but significant ancestral dimension. The Tarpana offered after the holy bath on Kartik Poornima morning reaches the ancestors in their realm. Lamps floated on the Ganga are understood as offerings to the Pitrus, lighting their path in the subtle world. Families who could not complete their Pitrupaksha rituals can perform sincere Tarpana and Deep Daan on Kartik Poornima as a supplementary observance.