Better late than never!!!!!
'Nav' means nine and Ratri means night. These nine nights occur on equinoxes when the sun is vertically overhead at the equator. The Cosmic Mother is worshipped during these 9 days.
The number nine is closely associated with the process of Creation in the cosmic time cycle. It is considered 'puran' or complete. Any number multiplied by nine gives a figure that adds up to nine.
Ratri means night. The Rigveda states that creation came about when everything was covered in
the darkness of night. Navratra signifies the concept of 'Back to Godhead'. The entire cosmic cycle cosists of three phases: Creation, Preservation and Dissolution. If one was to split each part into triads, then 3 times 3 would be 9.
She is the 'Garbha' (Womb) from where the Universe manifests. The word 'Garba' (The dance performed during Navratri) stems from 'Garbha' and symbolises the 'Dance of Creation'
There are 9 cosmic wombs or Nava-yonis.