Agrahayana or Margashirsha is the ninth month of the Hindu lunar calendar and the Indian national calendar. The name of the month is derived from the position of the Moon near the Mrigashīrsha nakshat

Katyayani is a form of the Hindu goddess Mahadevi, venerated as the slayer of the tyrannical asura Mahisha. She is the sixth of the Navadurga, and is worshipped on the sixth day of Navaratri.