namaH shrIpurabhairavyai
kAla gaNanA is accomplished normally by adopting pa~nchA~Nga scheme which most of us are familiar with. The five angas are:
1. Tithi
2. nakShatra
3. yoga
4. karaNa
5. vAra
Similarly, a parallel calendar is used by Srividyopasakas who have undergone pUrNAbhiSheka, called devImAna aShTA~Nga. The source for this scheme is Rudrayamala, Shaktiyamala, Paramananda Tantra, Kaulikarnava, Tantraraja, Srigarbha Kularnava, Nathakrama patala of Badabanala, Tripurasundari Tantra and works such as Saubhaya Tantra, Saubhagya Chintamani, Dattareya Samhita, Saubhagyodaya, Nitya Kalpa, Nathodaya, Kala Nitya Nirnaya, Durvasa Kalpa etc. The knowledge of Ashtanga is considered very auspicious and important for a Srividya Upasaka as it has various applications in Japa, Puja, Parayana, Kala Nitya Krama etc. The Ashtangas are:
1. Yuga
2. Parivritti
3. Varsha
4. Masa
5. Divasa
6. Nityaa
7. Vasara
8. Ghatikodaya
The number of yugas are: 36
Every Yuga has 36 Parivrttis
Every Parivrtti has 36 years
Every year has 16 months
Every month has 36 days
Every month has 15+15 Nityas
Every week has 9 days and so on.
Devi herself pervades everything as kAlanityA and these form her organs or avayavas. Like rashmi samkalana normally done applies to desha sundarI, aShTa~Nga is applicable in terms of kAla sundarI. As this refers only to kAla and not desha, samkalpa is incomplete if performed only using aShTA~Nga, which is unfortunately followed by most due to incorrect understanding of the Tantra. For the same reason, Samkalpas printed in Srividya Nityahnikam, Kanchi Mutt Panchangam, Coimbatore edition etc. should not be adopted directly. The procedure for desha kirtana is to be learnt from Sadguru. Further, Mahayuha, Kalpa, Mahakalpa, Natha Yuga, Nitya Yuga, Matrika Yuga and other concepts are also used by Upaskas. Shodashanga and Dvatrimshadangas are also known but less used due to complexity.
On Aug 27, the new Parivrtti [daM chakShustattvAkhya] will start and this will result in ten mahAyogas [from puShpiNI to chandroparAga] to converge on the same day. This day is more auspicious can one can ever imagine and occurs once in every 144 years. Worshiping Paradevata on such a day will invite divine grace. This day is of greater significance at Kanchipuram as Sage Durvasa performs Mahabhisehka and another auspicious ritual to Sri Kamakshi on this sacred day in the presence of all celestial deities. Those who behold the Sri Vigraha of Kamakshi and the Salagrama Srichakra attain great merit. Japa, Homa, Saparya, Tarpana, Brahmana Bhojana etc performed on this day yieldgreat phala. Also, on this sacred day, the cycle of lopAmudrA culminates and the age of Sri Bhairava commences. The Maha Samayaa for this day is Jaya Durga, Nakshatra Yogini is Vajra Kubja, Dina Yogini is Guhya Kali and soon. The Euphoria associated with this sacred day can only be experienced and not expressed in words.
darpA~Nkuro makaraketanavibhramANAm
nindA~Nkuro vidalitotpalachaturINAm 
dIpA~Nkuro bhavatamisrakadambakAnAm
kAmAkShi palayatu mAm tvadapA~NgapAtaH 
