I have posted a blog on the essence of Navaratri,Golu.
Couple of Posts on the Slokas Poojas details to be followed during the Navaratri.
i am recommending a site where you can get the dates of all Hindu festivals for future as well.
Navaratri in 2013 will start on Saturday, the 5th of October and will continue for 9 days until Sunday, the 13th of October.
The Navratri commences on the first day (pratipada) of the bright fortnight of the lunar month of Ashwin. The festival is celebrated for nine nights once every year during the beginning of October, although as the dates of the festival are determined according to the lunar calendar, the festival may be held for a day more or a day less.”
The term more or less is not indicative of ambiguity.
Now the Kanchi Periyava Forum, dedicated to the Maha Periyavr has provided a Link for an E Book on Navaratri, which is quite informative.
You may download it for reference.
Navarathri is celebrated five times a year. They are Vasanta Navaratri, Ashadha Navaratri, the Sharada Navaratri, and the Paush/Magha Navaratri. Of these, the Sharada Navaratri of the month of Puratashi and the Vasanta Navaratri of the Vasanta kala are very important.
1. Vasanta Navaratri: Basanta Navaratri, also known as Vasant Navaratri, is the festival of nine days dedicated to the nine forms of Shakti (Mother Goddess) in the spring season (March–April). It is also known as Chaitra Navaratri. The nine days of festival is also known as Raama Navratri.
2. Gupta Navaratri: Gupta Navaratri, also referred as Ashadha or Gayatri or ShakambhariNavaratri, is nine days dedicated to the nine forms of Shakti (Mother Goddess) in the month of Ashadha (June–July). Gupta Navaratri is observed during the Ashadha Shukla Paksha(waxing phase of moon).
3. Sharada Navaratri: This is the most important of the Navaratris. It is simply called Maha Navaratri (the Great Navratri) and is celebrated in the month of Ashvina. Also known as Sharad Navaratri, as it is celebrated during Sharad (beginning of winter, September–October).