Of the above months, the solar month of Leo / AavaNi has a special significance. On the 6th day of that month there must be some rains as per the above information. Even if it does not rain, thunderbolts must be heard on that day. If so, it would rain well in the rainy season. The thunderbolt of Leo 6th is known as “AavaNi muzhakkam” or the “Roar of AavaNi / Leo / ShravaNa”. The thunderbolts must be heard loudly. I think this also pertains to individual localities.
Following observations are done in the solar month of Ashada or Aadi or Cancer. Only the solar month must be taken into account even if lunar month of Shravana had started.
The following are a kind of checklist for rainfall as the season progresses.
Reddish tinted clouds seen on the days of particular stars (the star of the day is ascertained from the transit of Moon in a star) are indicators of ensuing rainfall.
(1) Crescent Moon.
The 3rd day of waxing Moon holds the clue to the normal nature of the monsoon. This phase of the moon is popularly known as “MoonRaam piRai” – the 3rd phase of the crescent moon. People consider it to be rare to see this as it will be low in the sky and hidden by clouds in the monsoon season. But this phase of the crescent must be somehow sighted to make sure that the tips of the crescent are in the expected positions that guarantee good monsoon and reasonable price level ( as a result of good monsoon). This also means that the path of moon and earth has to be in ideal places which ensures ideal meteorological activities for a good monsoon.
In the Monsoon season, sun or the moon will be often seen surrounded by a halo called in astrology as “Parivesha”.
In Ashadi Yoga, this observation is done. On the day of Full Moon in Ashada month (Aadi in Tamil), it is good to see a halo around the moon. The observation must start right from the time Full moon is sighted in the evening and continues till dawn. The duration is divided into 3 parts of 4 hours each.
Major tips on rainfall prediction of Vedic seers have been covered so far in the 7 articles of this series. One can observe that almost all of them are scientific and not dogmatic. They are derived from observational meteorology and astronomy and cross checked with rainfall in a particular place. Most of them are not part of today’s science of meteorology, but it would be beneficial if modern science of meteorology takes them into account – of course after checking them. After all, today’s science of meteorology is only a few centuries old whereas this wisdom of seers had been in place for a known period of minimum of 2000 years and more. In olden days – not long ago – until the traditional system of education was replaced by today’s education, this was one of the main topics taught and studied in schools of astrology.