Masik Karthigai (மாத கார்த்திகை) is observed every month on the day the Moon transits Krittika Nakshatra, and is especially significant in Tamil tradition, dedicated to Lord Shiva and Lord Murugan.
Devotees light lamps (Deepam) in the evening, most prominently during the annual Karthigai Deepam in the Tamil month of Karthikai.
A day-long fast is commonly observed, broken after lighting the evening lamp.
| Date | Vrat Name | Tithi Ends At |
|---|---|---|
| Tuesday, October 27, 2026 | Masik Karthigai | Nakshatra-based (full day) |
| Tuesday, November 24, 2026 | Masik Karthigai | Nakshatra-based (full day) |
| Monday, December 21, 2026 | Masik Karthigai | Nakshatra-based (full day) |
| Monday, January 18, 2027 | Masik Karthigai | Nakshatra-based (full day) |
| Sunday, February 14, 2027 | Masik Karthigai | Nakshatra-based (full day) |
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