Click HERE for these official data about rainfall and their sources. Standard methods of BPHS (Brihat Parashara Horaa Shaastra) are used to analyze mesha pravesha bhaava-chalita charts made from Mt Meru (Mt Kenya). This method is very simple, but Ganita must be Suryasiddhantic for 100% accurate results. If physical astronomy is used, we get mixed results, sometimes right and sometimes wrong. Here, 100% accuracy means absence of a single false result, but some persons guess that the talk of 100% accuracy means 100% accuracy in absolute quantity of rainfall, which is impossible for any mortal. Astrologers say you are going to have good earning during so and so period ;is any astrologer capable of predicting how much money you will get ? Evaluate what is offered here, and do not pose impossible questions which only God can answer.
IITM data at its website was arranged in terms of Gregorian calendar beginning with January. For comparison with Mesha-pravesha kundalis, this data was converted by me into year beginning with April. Mesh samkrānti occurs around mid-April, but negligible rainfall takes place in first half of April as compared to total annual rainfall, hence such a dataset was comparable to Mesha-pravesha kundalis from Meru. Another point which must not be overlooked is that we must follow the ancient Suryasiddhāntic mathematics with updated bīja-samskāras according to ancient principles. Here, the results are being presented, which were categorized into three categories : above normal rainfall (>+10% of normal, ie >110%) with 20 instances, normal rainfall (+10 to -10% of normal, ie, 110-90%) with 93 instances, and below normal rainfall (less than -10% or 90% of normal rainfall) with 22 instances. Here, 10 best and 10 worst rainfall years are being presented together with their astrological analyses. Aspects are given in the conventional scaling with 60' as full aspect.
Kundalee Software's version 6.7.2 and upwards can be used to make both Suryasiddhaantic and Drik (modern physical astronomical tables of Swiss Ephemeris, the latter being based on NASA's JPL datasets) charts on maps with utmost accuracy. JHorā software can be used for Drig-pakshiya computations (ie, based on physical astronomy). JHora uses astronomical database supplied by Swiss Ephemeris, the latter being based on NASA's JPL datasets, which are most reliable data of modern physical astronomy. A simplified software of Swiss Ephemeris can be freely downloaded by anyone, which shows half a minute errors. Hence JHora is reliable as far as physical planetary positions are concerned. But I use real Bhāvachalita based on Dasham computation which JHora lacks (no offence intended, I make predictions from actual Bhāvachalita and not from the Rāshi chart assumed to be same as Bhāva chart for time saving). Whenever needed, Bhāvachalita computations are given from another software.
Drig-pakshiya and Saura-pakshiya computations show minor differences in individual horoscopes, but in mundane charts they show large difference in Lagna due to the fact that a quarter degree difference in position of Sun results into 6 hours' difference in time of solar transit (Samkrānti, here Mesha samkrānti at whose time annual charts are made) which means a difference of about three rāshis in all bhāvas including Lagna, which makes comparison easy. Hence, whether Saurapaksha or Drikpaksha is best suited for astrology should be decided by means of comparison of mundane charts at the time of solar transits.
Centre of the Rāshi Chakra is at Mt Meru (Mt Kenya), and middle point of Mesha is always towards the east. Hence, almost the whole of India lies in the Vrish rāshi with Venus as Lord, excluding most of J&K which lies in Mithuna and a small region around Kanyākumārī which lies in Mesha. There are seven types of Kūrma Chakra (KC) which is called Mahā-chakra in Ādi-Yāmala Tantra : Prithvi KC (shown as Padma Chakra in Narapatijayacharyā), Desha KC (which is wrongly called Prithvi Chakra in Narapatijayacharyā)), Pradesha KC (which is described under Desha KC in Narapatijayacharyā), Nagara KC for town, Grāma KC for village, Kshetra KC for plot of land, and Griha KC.
Instead of using Kūrma Chakras here, fixed Rāshi Chakra with movable Bhāvachalita is used here in Prithvi Chakra mode (called as Padma Chakra in Narapatijayacharyā) with centre at Mt Meru. Same basic design can be easily modified to make all other Medini chakras of ancient Yāmala tantras for making world forecasts. Desha chakra for Bhārata will be presented elsewhere at this site.
Rāshis are always fixed, shown with black dotted lines in the maps, but Lagna changes with respect to time of Mesha Samkrānti. Hence, the 12 bhaavas of bhāvachalita move with Lagna as first bhāva ; due to this movability bhāva-chakra is known as bhāva-chalita (shown in coloured dotted lines in the maps below) . Although most of India lies in Vrish, sometimes large portions of South India may be lorded by Mars due to mid-point of its bhāva falling often in Mesha. Similarly, portions of NW India may often be lorded by Mercury. There are some exceptional cases when a planet fails to be lord of a bhāva which it owns in rāshi chart due to the fact that the middle of that bhāva falls in another rāshi not owned by that planet. For instance, if starting point of Kanyā is after mid-point of a particular bhāva, and end point of Kanyā ends before the middle of next bhāva, then none of these two bhāvas will be lorded by the lord of Kanyā, ie, by Mercury. BPHS (Brihat Parāshara Horā Shāstra) gives both types of bhāva charts, accurate bhāva-chalita as well as crude bhāva-chakra assumed to be same as rāshi-chakra for time saving. Some astrologers use rāshi-chakra for making bhāva-phala. This practice gives wrong results, which is proven by following study.
Only Suryasiddhantic bhaavachalita chart is shown on map, but even Drikpakshiya (based on physical astronomy) bhaavachalita chart can be easily visualized on same map by mentally rotating the bhaavachalita chart : anticlockwise if Drikpakshiya Lagna (ascendant) is more in value than Suryasiddhantic Lagna, and clockwise if less. Magnitude of this rotation should be equal to the difference in Lagnas.
Many complexities of phalita jyotisha are clarified by following studies. Most important of all, it helps us in valorization of the overall result of horoscope : we can correlate quatitative magnitude of rainfall with horoscopic conditions, and use this experience in evaluating individual horoscopes quantitavily. It is the most difficult part of phalita jyotisha, never perfected by anyone. If it is perfected, we will be able to predict the quantity of predicted results. Quantitative studies of rainfall or national economic growth helps us in this regard.
Ten best and 10 worst years of Annual Indian Rainfall mentioned above are astrologically analyzed HERE, made with older software. Even better charts on maps can be created quickly through current version of Kundalee Software (by selecting "Medini" in folder and "MeruWorldChart" in File options at top of the starter form; interesting cases can be saved as MeruWorldChart-1 , MeruWorldChart-2 or with year number added such as MeruWorldChart-2012).