Kartika Deepam (Tamil: கார்த்திகை தீபம், romanized: Kārtikai tīpam) is a festival of lights that is observed mainly by Hindu Tamils, and also by adherents in the regions of Kerala, Andhra Pradesh, Telangana, Karnataka, and Sri Lanka. Celebrated in Tamilakam since the ancient period, the festival is held on the full moon day of the Kartika (கார்த்திகை) month, called the Kartika Pournami, falling on the Gregorian months of November or December. It is marked on the day the full moon is in conjunction with the constellation of Kartika. It corresponds to the occasion of the Kartika Purnima, though it falls on a different day due to the correction of equinoxes in the Tamil calendar.