Karthigai Masam, or Karthika month, is the eighth month in a traditional Tamil calendar and it derives its name from the Nakshatram, or star, ‘Krithiga.’ Tamil Month Karthigai in 2021 begins on November 17 and ends on December 15. The Mondays in the month are dedicated to Lord Shiva and Karthigai Somavara Vratam is observed. Another important ritual in the month is the Karthigai Deepam. Ayyappa devotees start the 41-day Ayyappa Deeksha Vratam and take a pilgrimage to Sabarimala in this month. Importance of Karthigai Masam Karthigai Deepam Karthigai Masam is also famous for the row of lights that are lit in the month. Houses and streets are decorated on the Karthigai star day in the month with lamps and it is known as Karthigai Deepam (November 19, 2021). Thiruvannamalai Deepam It is believed that Lord Shiva gave darshan to Lord Vishnu and Brahma in the form of a pillar of fire with no ends on this day. This form is also referred as Annamalai Deepam in Tamil and is