Lord Vishnu goes to sleep on Ashadha suddha ekadashi and wakes-up on Kartika suddha ekadashi
Lord Shiva kílled Tripurasuras on Kartika purnami and protected the world.
In this month Ganga (Godess of river Ganges) enters in to all rivers, canals, ponds and wells and makes them as pious as Ganga.
Ayyappa deeksha is also taken in Kartika masa and is continued up to Makara Sankranti (Jan 15th)
Kartika masa -History:
Kartika Masa begins from Aaswayuja sukla purnami up to one month. In this Month Lord Shiva and Maha Vishnu are worshipped and prayed. People during this month observe strict rituals. The daily activities starts early in the morning taking bath with cold water, going to temple, lighting deepa, fasting and saligrama pooja. The most auspicious days in this season are Mondays which is very important to Lord Shiva. As per the puranas it is believed that by performing the kartka Masa vrata we can drove away the past karmas and the sins committed can be destroyed. Lighting Lamps with ghee made from the cow’s milk during the sunrise and sunset brings prosperity, wealth, health into our lives. It also burns the material desires in between our birth and death.
Also Tulasi plant is prayed and worshiped daily by lighting a deepa during this month. There is story behind this Tulasi came as a sister of Goddess Lakshmi when amrita Mantham Ocean is churned. Tulasi wanted to marry Lord Vishnu but Lakshmi did not like this and cursed her to become a plant. But Lord Vishnu took pity and for fulfilling her wish he gave a boon that when he is in form of saligram, tulasi will be close to him. On Kartika Shukla Dwadashi Tulasi plant is decorated and prayed.