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Eternal Astro Physics,
Sanatana Jyotis Shaastra, has many branches. One of them is Astro
Meteorology, which is an integration of Meteorology, an atmospheric
science and Astrology, the Wisdom of the Nine Revolving Heavens. The Solar
transits of the constellations are studied and each solar transit was
found to have some characteristics. The Kerala mathematicians, after years of
Experimentation, Observation and Hypothesis, came up with the Kerala
Njauttuvela Calendar. Intuitive Sciences involve the sixth element of Intuition also. 
Annual Rainfall, monthly rainfall, rainfall map, tropical rainforest rainfall, rainfall intensity, rainfall cycles are all measured by Sanatana Jyotis Kalavasttha Saastra or Astro Meteorology.
World class astronomers ( Madhava, Paramesvara et al ) observed the Heavens. They indulged in Observation, Experimentation, Hypothesis, Generalisation and Classification, which is the Fivefold Scientific Method and they devised the Vedic Calendar accurately.
According to Physics, the land gets heated faster than the Sea and cool winds from the Bengal of Bengal pick up moisture and pour over India, during Thula Varsha. The reverse happens during Edava Pathi ( Half sidereal Taurus, that is when Sun enters the 15th degree of Edava or Taurus ) cool winds from the Indian Ocean pick up moisture and precipitate over India !
This astronomical phenemenon was known to the Indian mathematicians who accurately devised the Calendar and the two Monsoons,
Kala Varsha and Thula Varsha !
Degrees Event
| 0 | Vishu |
| 10 | Patham Udayam |
| 45 | Kala Varsha |
| 90 | Dakshinayana |
| 120 | Mal Era Start |
| 180 | Thula Varsha |
| 210 | Mandala Kala |
| 270 | Uttarayana |
Kala Varsha - From May 29 to Sep 16
Thula Varsha - From Sep 17 to Dec 26
|
|
In Kerala, only three major seasons are experienced.
They are more or less related to the revolution of the Earth or the Sun's
longitude.
Shaithya, Winter -When Solar Longitude is in between 240 and 300. ( Dhanus,
Makara )
Ushna, Summer - When Sun's longitude is in between 300 and 45 ( Kumbha, Meena,
Mesha and 1/2 Vrishabha )
Varsha, Rainy Season - When Sun's long is 45 - 240 degrees,.( Half Vrishabha
to Vrischika )
The best books on Astro Meteorology
Mysterium Cosmographicum - By Kepler
The Krishi Geetha - by Parasurama.
The Farmer's Almanac
Here are some articles which integrate Meteorology and Astrology
Post Relativity, the scientific outlook has changed. Old Physics has been replaced by the New Physics of Capra, The Tao of Physics.
Since the present is a product of the Past, it is logical to assume that the Future is contained in the Present, inasmuch as it is determined by the Present. So by using the summation of the psychological knowledge of Antiquity , one can know Past, Present and Future. Our Astro Expert can decipher the Heavenly Codes .
Hindu Astrology Consultancy & Software
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Vedica, 
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93885 56053 7C Shaktan Manor Apts S T Nagar Trichur 680001,