Saptanadi Chakra
1. Saptanadi Chakra is very useful in prediction of weather, especially for rainfall. There are two variants based on two ancient sources of Saptanadi Chakram: Narapati Jayacharyā and Krishi-Parāshara and all later texts are based on them. The original source of Saptanadi Chakra was a Tantric text titled ‘Yāmaleeya-Svarodaya’. 2. There are 27 Nakshatra for the purpose of astro-meteorology. Apart from these, the 28th Nakshatra ‘Abhijit’ is also allotted a space towards the end of Uttarashada. 3. These Nakshatras are subdivided into 7 Nadis starting from ‘Krittika’ (3rd Nakshatra) as ‘Vat Nadi’ followed by ‘Ativat’, ‘Dahan’, ‘Soumya’, ‘Neera’, ‘Jala’ and ‘Amrita’ and the sequence continues as shown in the diagram below. The sequence follows a serpentine pattern. This is called ‘Saptanadi Chakra’
- Saptanadi Chakra
• If the entry of Sun in Aridra Nakshatra happens after sunset and before the next Sun rise, it is good for rainfall and weather.
• All other times are considered inauspicious. Solar entry in Aridra Nakshatra between sunrise and 12 noon is especially bad and points towards coming famine.
• Sun entering Ardra during late evening or night indicates widespread and plentiful rainfall leading to good crops and easy availability of food grains.
Varahmihir’s Principles of Weather forecast:
•Aswini, Krittika, Rohini, Purvabhadra, Uttarabhadra, Anuradha, Sravana, Punarvasu and Pushya are masculine Nakshatras.
• Bharani, Hasta, Chitra, Swati, Visakha, Purva, Uttara, Aslesha, Magha, Jyeshta, Aridra, Dhanista, Purvashadha and Revati are feminine Nakshatras.
• Satabhisha, Mrigasira and Moola are neutral.
• When the Sun and the Moon are in neutral Nakshatras there will be winds.
• When they are in feminine Nakshatras there will be lightning and thunderstorms.
• When the Sun occupies a feminine Nakshatra and the Moon a masculine one or vice-versa there will be rains.
• When many planets are in one Rashi, preferably in one Nakshatra, it affects the weather.
• When many planets gather in one Rashi with Mars and Sun joining them and Mars is with Rahu, there can be a terrible downpour.
• When there is concentration of planets in one Rashi, the weather begins to fluctuate and if Moon joins them, there will be heavy downpour.
• When Mars transits from one Rashi into another within two days there is a perceptible change in weather and in the rainy season there will be good rainfall. Mars is the most powerful planet causing rainfall.
• Cancer, Pisces and Capricorn are full watery signs; Taurus, Leo and Aquarius are half watery signs; Aries, Libra and Scorpio are quarter watery signs while Gemini, Virgo and Sagittarius are non watery signs.
• Moon and Venus are full-blown watery planets.
• During Dakshinayana malefic planets (Saturn, Sun, and Mars) transiting through the Amrita, Jala and Neera Nadi, would give rise to ordinary rains.
• If benefic planets transit the above constellations, there will be plenty of rain.
Predictions for the Year 2011
For this we have to cast a chart when the Sun enters Aridra Nakshatra. In this year Sun entered Aridra Nakshatra at 1606 hrs on 22 June 2011 and the chart below is cast for New Delhi for that day and time.
1. Brihat Samhita by Varahamihira
2. Applied Astrology by KN Rao
3.Time Tested Techniques of Mundane Astrology by MS Mehta and A Radhika
4. Astrology in Predicting Weather and Earthquakes by BV Raman.
5. Mundane Astrology by KB Gopalakrishnan.
6. Raphael’s Mundane Astrology by Raphael
7. Mundane or National Astrology by HS Green
Jyothishi 
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