These books typically contain:
Chaturmas literally translates to "four months." It begins with the auspicious month of (June-July) on the day of Devshayani Ekadashi (the eleventh day when Lord Vishnu goes to sleep) and concludes on Prabodhini Ekadashi (when He wakes up) in the month of Kartik (October-November). sampurna chaturmas marathi pdf portable