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.
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 !
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
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
|Solar Transit of Gemini|
|Vishu, the planting season of Kerala|
|Thula Varsha||Astro Meteorology and Economics|
|Edava Pathi||Global Warming|
|Rainy Solar Transit of Lamda Orionis ( Makiryam Njattuvela ) strikes Kerala||Global Warming causeth Climate Change|
|Rains galore as Sun transits Alpha Orionis !||Rainy Solar Transits or Njattuvelas|
|The Vedic Astro Calendar||Destructive Njattuvelas|
|Rainfall Cycles||Climate Change good for Kerala|