Karka Sankranti marks the day the Sun enters Karka Rashi (Cancer) — typically around July 16 each year. This transit signals the beginning of Dakshinayana, the Sun's six-month southward journey, which lasts until Makara Sankranti when Uttarayana begins. In Hindu cosmology, Dakshinayana is associated with the realm of the Moon (Chandra) and the ancestors (Pitru), whereas Uttarayana belongs to the realm of the Sun and the devas. The shift is considered significant enough that Bhishma Pitamaha famously waited on a bed of arrows through Dakshinayana to leave his body only after Uttarayana began.

The Season of Pitru and Ancestor Worship

With Dakshinayana beginning at Karka Sankranti, it is considered the ideal time for Pitru Tarpana (water offerings to ancestors), Shraddha ceremonies, and prayers for departed souls. The months of Dakshinayana — particularly Bhadrapada (Pitru Paksha) and the monsoon months — are especially sacred for ancestor rituals in Hindu tradition. Families observe Masa Amavasya more diligently during this period and many plan formal Shraddha ceremonies. Karka Sankranti day itself is auspicious for a Tarpana ritual at a river or sacred water body.

Chaturmas: The Four Sacred Months

Karka Sankranti is also when Chaturmas (the four holy months) begins. During Chaturmas — Ashadha, Shravana, Bhadrapada, and Ashwayuja — wandering monks and sadhus settle in one place rather than travelling. Weddings and major auspicious ceremonies are traditionally avoided during this period. The reason is partly practical (monsoon season makes travel difficult) and partly spiritual (the devas are asleep — Vishnu enters his cosmic sleep on Devshayani Ekadashi, which falls close to Karka Sankranti). The period ends with Prabodhini Ekadashi when Vishnu wakes up.

Ritual Observances

On Karka Sankranti, devotees take a ritual bath in a river or sacred water body at sunrise. Sesame (til), rice, and water are offered as Tarpana to ancestors. Visiting Shiva and Vishnu temples is auspicious. Charity — particularly of umbrellas, footwear, and water pots — is believed to protect the giver and their ancestors from the heat of the sun's southward journey. Many families also begin Pitru-specific vows or begin preparations for the upcoming Pitru Paksha (Mahalaya fortnight) that falls in Bhadrapada.