Sapta Nadi Chakra - predicting rains

For making a Sapta nadi Chakara we need to use 28 Nakshatra scheme. ‘Abhijit’ is also included. These Nakshtras are subdivided into 7 Nadis starting from ‘Krittika’ (3rd Nakshatra) as ‘Vaat Nadi or Airy Nadi ’ followed by ‘Ati-vaat or PrachandNadi’, ‘Dahan’, ‘Soumya’, ‘Neera’, ‘Jala’ and ‘Amrita’.
सौम्यनाडीगता मध्या नीरस्था मेघ वाहका: |
जलायां वृष्टि दशचन्द्रोSमृतेचाप्यतिवृष्टिदा: ||



Usually Vaat produces windy weather, Ati-vaat produces cold weather after Rainstorms, Dahan increases temperature depending on the environment as Dahan Nadi is very sensitive nadi wrt to nature and surroundings and it gradually increases with the time and environment, and Soumya, Neera, Jala and Amrita nadis are rain producing Nadis.

The transit of planets in each of this causes different effects on rainfall. This chakra must be one of the oldest rules of astrology because this takes into account 28 stars and not the currently held 27 stars.

There are two variants based on two ancient sources of Sapta-nādi-chakram
Narapati-jaya-charyā and Krishi-Parāshara, and all later texts are based on them, such as Kadambini.
The original source of Sapta-nādi-chakra was a Tantric text 'Yāmaleeya-Svarodaya'. Here, both variants of Sapta-nādi-chakra currently used by many traditional Panchāngas are being presented ('Nakshtra' means Nakshatra).

Here, both have been presented in a well-ordered manner, which makes it easy to see that the left table is correct, because in it planets are placed according to their geocentric (or Meru centric) distances: Saturn-Jupiter-Mars-Sun-Venus-Mercury-Moon.

In the right table, Jupiter and Sun are accorded lordship of wrong Nadis.
Narapati-jaya-charyā can be procured from Chowkhambā Sanskrit Sansthān (Vārānasi). It gives some ancient rules for using this chakra

Original (Ancient) Design :
Nādi	Chandā	Vāyu	Dahnā	Saumyā	Neerā	Jala	Amrit
Lord	Saturn	Jupiter	Mars	Sun	Venus	Mercury	Moon
Nakshtra	3	4	5	6	7	8	9
Nakshtra	16	15	14	13	12	11	10
Nakshtra	17	18	19	20	21	22	23
Nakshtra	2	1	28	27	26	25	24

Narapatijayacharyā's (~1000 AD) Design :
	Heat Providing				Rain Providing
Nādi	Chandā	Vāyu	Dahnā	Saumyā	Neerā	Jala	Amrit
Lord	Saturn	Sun	Mars	Jupiter	Venus	Mercury	Moon
Nakshtra	3 M	4 M	5 M	6 F	7 F	8 F	9 F
Nakshtra	16 N	15 F	14 F	13 F	12 F	11 F	10 F
Nakshtra	17 N	18 N	19 M	20 M	21 M	22 M	23 M
Nakshtra	2 M	1 M	28 M	27 M	26 M	25 M	24 M
M = Male    -                             F = Female                      -                         N = Neutral

1. Prachandā-nādi ruled by Saturn represents fierce winds.

2. Vāyu-nādi ruled by Sun is for more than normal winds.

3. Dahnā-nādi ruled by Mars represents more temperature.

4. Saumyā-nādi ruled by Jupiter represents normal conditions and strike a balance between intense heat and soon to come cool by early Monsoon showers. It is also called Madhya Nadi.

5. Neerā-nādi ruled by Venus a watery planet and represents normal rains. Also represent first shower of monsoon.

6. Jala-nādi ruled by Mercury represents more (plenty of) rains.

7. Amrit-nādi ruled by Moon a watery planet represents maximum rains.

The first three Nadis Prachanda, Vayu and Dahan are known as Yamya or Dakshina Nadi.

Three Nadis Neer, Jala and Amrit are known as Sheetal Nadi. These are rain providing Nadis.

Saumya Nadi is also known as Madhya Nadi or Hala Nadi.

Start from Krittika (= number 3, numbering begins from Ashwini) in Prachandā-nādi and assign nakshatras to Nadis in the serpentine manner as shown in the tables above. Traditional texts present Sapta-nādi-chakra in a confusing manner, which makes it difficult to decide which of the two chakras is correct. 

-:Anju Anand