Dhanurmasa is one of the most auspicious months for Lord Vishnu. It generally starts on December 16 or 17 and ends on January 13
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The word Shesha Sai means the one who lays or sleeps on the Serpent; it is Lord Vishnu.
Kartika Purana says that every Monday in this month is holy. So, one can observe fasting on all Mondays or any Monday, and eat