One derivation of the word Dasera is from dashhara. 'Dash' means ten and 'hara' means defeated. Nine days before Dasera, in the nine days of Navaratri, all the ten directions are saturated with the female deity's (devi's-Shakti) energy. 'Shakti' has control over creation in all the ten directions (dikbhav), attendants (gan), etc. That is why this day is known as Dashhara, Dasera, Vijayadashami, etc. This is one amongst the three and a half auspicious moments (muhurts) of the year. This falls on the tenth day (dashami) of the bright fortnight of Ashvin. The immersion of the Navratri (female deity) is done on the ninth day (navami) or the tenth day. Four rituals namely crossing the territory (Simollanghan), worship of the Shami tree (Shamipujan), worship of the deity Aparajita (Aparajitapujan) and worship of instruments (Shastrapuja) should be performed on this day.