Every month of the Lunar Calendar includes the Ashtami Tithi in the period of Shukla Paksha when moon is visible. Ashtami which is eighth day is dedicated to Goddess Devi/Shakti or Durga and is popularly called as Durgashtami. It is marked by long day fasting and worshipping by her devotees. However the most significant Durgashtami is the one falling in the month of Ashwin. It falls within the nine long days of Navaratri festival. Astra/weapon puja of Goddess Durga is done on Mahaashtami day while the monthly Ashtami is done once every month of the Lunar Calendar. Other names referred to Maasik Durgashtami include Monthly Durgashtami, and or Maas Durgashtami.
About Masik Durgashtami