Difference of Opinions in Astrology!

One problem which Astrology as a science suffers is the lack of uniformity. Apart from that, another area of concern is the difference of opinions creeping up which causes a difference in the way a particular horoscope is viewed. These variations are especially prominent between the Northern and Southern parts of India especially. Let's look at a few areas in which various view points exist.

- Birth Star of Planets:
There is a branch of Astrology called DNA Astrology which places a lot of emphasis on the birth star of planets and this information is effectively obtained from a text called "Vichitra Jothidam". But there are also old Bengali texts mentioning about the constellations in which the 9 planets took birth and there appears to be some difference as seen below:

As per Vichitra Jothidam (followed in South):
Sun - Hastha
Moon - Mrigaseera
Mars - Uthara Ashada
Mercury - Dhanishta
Jupiter - Pushya
Venus - Magha
Saturn - Revathi
Rahu - Bharani
Ketu - Ashlesha

As per old Bengali Texts:
Sun - Vishakha & Anuradha
Moon - Krithika & Rohini
Mars - Poorva Ashada & Uthara Ashada
Mercury - Shravana & Dhanishta
Jupiter - Poorva Phalguni & Uthara Phalguni
Venus - Magha
Saturn - Revathi
Rahu - Bharani
Ketu - Ashlesha

Additionally Brahmanda Purana and Vayu Purana has it's own take on the birth stars of planets and the list as per it tallies mostly with Bengali texts with the exception of Venus. However just one birth star is been listed here like Vichitra Jothidam unlike olden bengali texts which provides information that some of the planets were born out of 2 constellations.
Birth stars as per Brahmanda Purana / Vayu Purana:
Sun - Vishakha
Moon - Krithika
Mars - Poorva Ashada
Mercury - Dhanishta
Jupiter - Poorva Phalguni
Venus - Pushya
Saturn - Revathi
Rahu - Bharani (Rohini as per Vayu Purana)
Ketu - Ashlesha (Rohini as per Vayu Purana)

From viewing the above results, these seems to be a consistency maintained only with respect to Saturn, Rahu and Ketu. There is a mismatch especially with respect to Sun, Moon and Jupiter. For Mars, Venus and Mercury again the results don't blend perfectly when seen from all parameters.

- Special Navatara Chakra Scheme:
The Navatara Chakra or the Moon's asterisms play an important role in analysing which constellation plays a favorable role in the life of a native. Though there is no confusion of the Navatara as the name connotes 9 constellations but the total number is considered as 27 in some cases and also 28 in other cases. In South India for instance it's always only 27 stars whereas in pockets of Northern India, the factoring of Abhijit is made making the total as 28 stars. The difference creates an issue in the end result for eg the star which ends up coming as Vainasika pertains to destruction. Now let's say for a native who is born in Punarvasu Nakshatra, the 22nd Nakshatra from it namely Ashwini happens to be the star of destruction as per the 27 tara scheme. However when adopting the special 28 tara method, the Vainasika star changes to Bharani as the 23rd Nakshatra is considered in this case. This results in an altercation in analysis.

- Maraka Lords:
Maragathipathi or Maraka refers to the house lord that can cause a killing effect to the native. In general parlance and as advocated by most texts, the 2nd and 7th lord always end up being the Maraka Lords. However there is another opinion practiced in South which advocates the Maraka Lords based on the nature of the sign depending on whether it is movable, fixed or dual. The lordships associated as Maraka as per this means is as mentioned below:
Movable Sign - 2nd & 7th are Maraka Lords
Fixed Sign - 3rd & 8th are Maraka Lords
Dual Sign - 7th & 11th are Maraka Lords

- Panchanga Lords:
Here again there exists a difference of opinion. With respect to 3 of the elements viz Vara, Nakshatra & Yoga there isn't much headroom though of course there is always a question mark with respect to whether the Nakshatras need to always be as per the Vimshottari Dasa scheme or not. However on Tithi and Karana there is a difference. For eg. in South and backed up by the Kerala Text ''Krishneeyam'',  Sasthi Tithi is ruled by planet Jupiter whereas in the Northern frontier Venus is considered as ruler of Sasthi. Most Tithis undergo a change in the ruler ship lord and similar is the case with Karana. For instance Kaulava Karana is said to be ruled by Saturn in Southern folklore whereas in the Northern regions, it is said to be ruled by Mars.

- Arudha Padas:
Arudha Pada or Bhaveshat Bhavam is largely a Jaimini concept where we calculate the efficacy of a house based on the distance it has moved from it's ownership sign. For instance Arudha Lagna or AL for a Gemini Lagna whose sign owner is Mercury if placed in 8th sign in Capricorn will end up being Leo as we need to move 8 signs from Capricorn to reflect the Arudha Pada. There are some exceptions to this rule which states that Arudha cannot be the same sign as house lord or 7th from it in which case we need to add a further 10 signs to arrive at the result. This exception based rule is mainly followed in certain sections but however these exceptions are also discarded in some traditions with just the resultant Arudha sign taken into account irrespective of it being the same or 7th from it.

- Chara Karaka Basis:
This again is largely a Jaimini concept where significators are listed based on the degrees traversed in a sign by a planet. There is however an unending debate whether 7 planets from Sun to Saturn or an additional 8th planet Rahu also should be included in the framework. The opinions are so widespread on this that most of the times there is a possibility of ending up having the wrong Amatyakaraka or Darakaraka as the case maybe.

- Aspects and Ownership of Rahu/Ketu:
This can safely be assumed that as never going to be solved. There is always a lingering question mark when it comes to these two chaya Grahas and the opinions are always at a juggernaut. Though there is a general view point that Rahu & Ketu both don't possess any aspect, there is a mixed say with respect to the aspects considered in North and South India. In the North, Rahu & Ketu are believed to possess 5,7,9 aspect akin to Jupiter whereas almost everywhere in the South, if indeed aspects are considered only 3,7,11 are taken into account. With regard to ownership, there is a general view that Rahu owns Aquarius and Ketu co-lords Scorpio but this theory does not find much footing in the South where it is largely considered as not owning any houses of it's own in the zodiac.

- Numerology of Planets
Though this is not something explicitly related to Vedic Astrology, there is a linkage of numbers with each planet ruling a specific number from 1 to 9. Here again there is a difference with respect to some of the numbers based on which planet rules them. There is a Nakshatra specialization text called 'Kumaraswamiyam' which mentions the numbers ruled by each of the planets which is different from the norm and adopts the Vimshottari Dasa order beginning from Sun.

Number ruled by Planets (Common System):
1 - Sun
2 - Moon
3 - Jupiter
4 - Rahu
5 - Mercury
6 - Venus
7 - Ketu
8 - Saturn
9 - Mars

Numbers ruled by Planets (As per Kumaraswamiyam following Vimshottari Dasa Sequence):
1 - Sun
2 - Moon
3 - Mars
4 - Rahu
5 - Jupiter
6 - Saturn
7 - Mercury
8 - Ketu
9 - Venus

As you can see above, only numbers 1,2,4 align properly in both systems and there is quite a marked difference when it comes to the other numbers ruled by the planets. Mercury for instance lords #5 as per the common system but is controller of #7 when adopting the other. Likewise Venus undergoes a change moving from 6 to 9 and so do few other planets as well.

Conclusion:
These are some of the major differences of opinions that exist in the framework of a horoscope analysis. With such varied views prevalent, there can always be a question of debate arising and also toppling up the analysis with diverse variations brought into the fray. Further research coupled with intuition is perhaps the only means to bridge the gap to a certain measurable extent.