- the name of a Vedic month occurring around October-November of the solar calendar, in which the Dāmodara form of Lord Kṛṣṇa is worshiped. It is stated in the Kārttika-māhātmya section of the Padma Purāṇa:śuklāṣṭamī kārttike tusmṛtā gopāṣṭamī budhaiḥ |tad-dinād vāsudevo ’bhūdgopaḥ pūrvaṁ tu vatsapaḥ ||“The eighth lunar day of the bright fortnight of the month of Kārttika is known by authorities as Gopāṣṭamī. From that day, Lord Vāsudeva served as a cowherd, whereas previously He had tended the calves.”see kārttika-vrata
The Bhaktivedanta encyclopedia. 2015.