1. In my opinion --- the fight between Ashuras and Devas --- literally means fight between deities of Lunar months and Solar months -- it should not be literally taken as fight between Aryans And Dravidians --it was merely a calendar war -- and war between solar priests and lunar priests ---
2. Note that all ancient Indian kings are descendants Solar dynasty (Surya Vamshi) or Lunar dynasty (Chandra Vamshi)--it is likely that those king supported solar calendars were Surya vanshi and those kings supported lunar calendar were Chandra vanshi --- the conflict between these two groups are eternal like Devas and Ashuras.
3. Mahabharata war ---many references about calendar --- (Rama's Vanvas period was 14 years)
At the time of calculation of 12+1 year --vanavas of Pandavas -- ends with Virada war --- instead of fighting battle--- Dhuryothan argues with Bheeshma that 12+1 year is not over ---Bheeshma says that 12+1 period is over ---
The battle was not important issue ---the real issue was the calendar----it is a reconciliation between solar calendar and lunar calendar that matters --Dhuryodhana calculates on the basis of solar calendar (to checked) whereas Yudhishtir calculates on the basis of lunar calendar (to be checked) ---
4.There is a possibility that this 12 years period is indicating the Khumbamela period---in turn-- this Khumbamela is held in total solar eclipse periods only ---which shows that during this eclipse period all the calendar priests assemble at important holy sites and correct their calendar to a new accurate year ---this +1 period might have indicated the correction months ---thus solar eclipses are very important to correct the calendars ----(note that solar eclipse occurs on the day of killing Sindhu king Jayathratha ---10th day(?) of the war)
Follow Andis Kaulins for more information in the following link---
http://megalithicworld.wordpress.com/
5.There is possibility that the 12 year period mentioned ---could be the time taken by Jupiter to complete the cycle around ecliptic pathway ---ancient priests --- Jupiter priests could have reconciled their solar calendar and lunar calendar ---at the cycle of 12 year and the +1 year could be the intercalation year or months ---
4. ancient days the corrected the calendars after a long gap (say 12 years) because the calendar calculations go haywire and seasons do not fall in correct time --- then ploughing and planting will not fall in correct time -- hence it needed a periodical adjustment --
5. On the arrival of messenger of Yudhishtir ---Rajpurohit of Panchala also --argues only one point -- this 12+1 period is over as per lunar calendar
refer the differences to solar months and lunar months in the following web page --
6.How do you conclude that Dhuryodhana is supporter of solar calendar--
note that Karna is offspring of Sun god -- but he sides with Dhuryodhana ---
Whereas Padavas may be ---really representing five planets visible to ancient astronomers --- accompanied by Panchali (God Venus)
7. The marriage of Panchali with five Pandavas ---should not be taken literally -- it is an astronomical story --- where the movements of five planets along with Venus should be taken into consideration ---
8. Various places visited by the Pandavas during their forest sojourn (Vanvas) (slavery period) should not be literally taken as the places of Gangetic plain --- it should be considered as the constellation visited by them during their journey along the ecliptic path in the heavens (sky)
9. this 12+1 period could be the period of Saros cycle (14+4 years) (metonic cycle)
http://en.wikipedia.org/wiki/Saros_cycle
Months names English and Sanskrit
(this 12+1 period is not exactly coinciding with 14+4 period)
The Metonic cycle is related to two less accurate subcycles:
8 years = 99 lunations (an Octaeteris) to within 1.5 days, i.e. an error of one day in 5 years; and
11 years (i.e. 19 less 8) = 136 lunations within 1.5 days, i.e. an error of one day in 7.3 years.
By combining appropriate numbers of 11-year and 19-year periods, it is possible to generate ever more accurate cycles.
10. or it could be the general slavery bondage period --in ancient Sumeria and a a regular custom among Jews ---
Generally the slavery period was 7 years --or multiples of 7 years --- after that the debtor is freed from bondage --- this shows that the bondage under gone by Pandavas could be the social custom of Sumerian people --- this custom could have been imported into India from ancient Sumeria ---
The biblical regulations concerning the Jubilee year form part of the Holiness Code, which appears in the Torah as part of the collections of laws given on Mount Sinai or Mount Horeb. According to these regulations, the Jubilee was to be sounded once 49 years had been counted,raising an ambiguity over whether the Jubilee was within the 49th year, or followed it as an intercalation in the 7 year sabbatical cycles; scholars and classical rabbinical sources are divided on the question.
The biblical requirement is that the Jubilee year was to be treated like a Sabbatical year, with the land lying fallow, but also required the compulsory return of all property to its original owners or their heirs, except the houses of laymen within walled cities, in addition to the manumission of all Israelite indentured servants.