Tarpaṇa is a term in the Vedic practice which refers to an offering made to divine entities. It refers to the act of the offering as well as the substance used in the offering itself. Tilatarpana is a different but associated term that is sometimes confused with Tarpana. Tilatarpana is a specific form of Tarpana involving libations offered to the Pitrs using water and sesame seeds during Pitru Paksha or as a death rite. Tarpana means Arghya, an offering. It is offered to all devas as well as the Navagrahas whenever mulamantra is recited as japa. Instances of welcome Tarpana are: Cow's milk, water, sugar, saffron, cardamom, borneo-camphor, etc. are mixed and used as the offering according to the requirements. One Tarpana is offered for the recitation of every ten moolamantras and one for part thereof.
Tilatarpana
Tilatarpana is the Tarpana offered to Pitrus by male descendants who do not have a living father. This is offered at the first annual shraddha and during subsequent annual shraddhas, amavasyas, sankramanas, eclipses, and during visits to selected holy places of pilgrimage... Method of offering Tilatarpana:
Posture of hand while offering Tarpana
The posture of hand while offering Tarpana varies for offerings made to devas, rishis and pitrus.
Reasons for using (Gingelly) for Tarpana
Gingelly is not to be confused with Sesame which is from large tree; Gingellyis a small seed storing energy and hence considered a favorite of all Devas, Shani and pitrus. Lord Ganesha is commonly offered pancha-kajjaya, a delicacy made using sesame. Lord Shiva is worshipped with sesame seeds. For Lord Vishnu, Lord Brahma, Goddess Laxmi and Goddess Saraswati, Gingelly seeds are used in any of their favorite eatables and offered to bestow their special favors on the worshippers. Besides, it is used as a homa dravya in many havans and homas. Therefore, tila and tilatarpana should not be decried as inauspicious.
Reasons for offering Tarpana
It is believed that one’s pitrus will be eagerly awaiting for tarpana on all the above-mentioned occasions. If no offering is made, they will return to their places disappointed, and the descendant misses their blessings which he would have received, if he had performed his filial duties. Kosha Kushi is an important ritual item used in the Tantric worship of the Divine Mother and represents the yoni and womb of the Goddess, as well as the astral body within the physical body and the microcosm within the macrocosm. Many devotees expressed regret that they could not find koshakushi outside of India, so we searched Calcutta and its surrounding villages until we found a source for these high quality puja implements. Checkout different types of Kosha Kushi from https://hinduskart.com/product-category/puja-kits/koshs-kushi/
