Friday, May 14, 2021

Decipherment of Yavana and Kushana Śaka (Old Śaka-s) shows they are not Indic (Supplement to Mahabharata date series 15)

Previous

Next

Recap:

·         Śaka eras are subdivisions of Kali Maha Yuga devised and handed down by the sages, immediately after Krishna departed from this world.

·         There are six Śaka eras of which two were already over. We are now in the third Śaka era.

·         The king who eliminates the Śaka tribes (and Mleccha tribes such as Yavana, Parada, Pahlavas and such others) becomes the Śakakāraka.

·         Yudhishtira was the Śakakāraka of the first Śaka of Kali Yuga by virtue of having defeated the Śaka-s in the Mahabharata war. Computation of the Śaka named after him started only from the beginning of Kali Maha Yuga when he abdicated the throne. This Śaka started in 3101 BCE.

·         His Śaka went on for 3044 years after which it was replaced by King Vikrama by having subdued the Śaka tribes. His Śaka started in Kartika (Tula Sankramana of the sun) in the year 57 BCE. An alternate beginning also seems to have been followed from Caitra of 56 BCE

·         Vikrama’s Śaka went on for 135 years after which it was replaced by Shalivahana Śaka.

The identity of the Śakakāraka of Shalivahana will be discussed after sorting out the identity of the “Śaka’ eras found in some inscriptions that some scholars had linked with a Jyothisha Siddhanta intended for deciphering the Vedic time measures such as Kali Yuga.

We should first know that no Jyothisha Siddhanta would refer to the time scale other than the Vedic one (Kalpa – Catur Yuga – Kali Yuga) because Time is basically a measure of the Age of Brahma. The dates of these Siddhantas are related to some division of this Time of Kalpa or Yuga and not to an era of a Mleccha king. Depending on the type of the Siddhanta they compute the time of compositon either from the beginning of Kalpa or from Kali Yuga. In the latter case, the nearest Śaka is sometimes mentioned. This is the Śaka of Kali Maha Yuga but definitely not the Cyrus Śaka which I had shown to be non-existent. Nor it can be the Śaka of the Scythians or the Parthians or the Greeks suggested since the time of the colonial writers.

Did an “Old” Śaka exist?

Some inscriptions written in Brahmi or Kharoshthi are found to indicate an unspecified era. Scholars refer to it as the Old Śaka with some of them linking with it the Jyothisha Siddhanta of Bhaskara II. Since Siddhantic tradition adheres to the Śaka era of Kali Yuga, it is blatantly wrong to suggest that Bhaskara had given the date of Siddhanta Shiromani from the “Old Śaka”. To put at rest the mis-information of linking the Siddhanta with the Old Śaka, let me examine the list of inscriptions on the so-called ‘Old Śaka’ given in Epigraphia Indica, Volume 14.

Written in Brahmi or Kharoshthi these inscriptions carry the year number either as the regnal year of the king or the year number of an unspecified era that goes upto 399. I have boxed the year numbers in red.

Most of these inscriptions mention the month name, while some of them state the tithi and the day of the month. Notable is the fact that the month name is not always Vedic. In some inscriptions the Greek name of the corresponding Vedic month is given. Such names are underlined in blue.  

The 1st inscription from Taxila refers to the month as “Panemus” – the Greek equivalent of AshadhaSravana of the Vedic system. This name was never in use in India. The king was ‘Moga’ (Maues) of foreign origin who occupied Bactria and Afghanistan and parts of Pakistan where this inscription is found. There is no name of an era (Śaka) but the statement of 78 years could not be the regnal year of the king.

Another inscription is also found in the same region (Taxila) attributed to king Azes, again a foreign name, made in the year 136. He is identified as a Kushana King by the author in the Epigraphia Indica volume (no. 8 in the list)

 

This was issued on the same Ashadha month but on the 15th day, which could refer to the day of the Full Moon. The absence of any reference to the Full Moon - a tithi in the Vedic system - can have only two explanations, that the tithi system was absent in the time scale of this dynasty or there was no importance to the day of Full Moon as in the Vedic system. Only borrowed material can appear devoid of core elements. 


All the above inscriptions mention the Vedic months and some of them the tithis too. Most of these inscriptions were made in the times of the Kushana kings having their own era. “Gushanasa rajami” in Panjtar inscription (No 7) is an obvious reference to a Kushana king. The Kushanas were not of Indic origin but moved from north China to Greco-Bactria as per the Chinese Book of Later Han.[1] The Hellenistic influence on them is seen in the names of the months in the inscriptions. One-way transfer of the elements of Time from Vedic to Greek is inferred from the adaptation of the tithi- months that have their own cycles traceable from the beginning of Kali Yuga.


An era is obviously detected in inscription No 11 and 12 while the others refer to the regnal year of the king. The 13th inscription was made in the reign of Devaputra Kanishka of Kushana dynasty in the month Daisika, a Greek name. The appearance of the Greek month name in the inscription need not be construed as proof of presence of Greek language in the local vernacular.

Generally the text of the grant is dictated or given by an officer of the royal court at the order of the king. Greek names popping up here and there in the inscriptions show the mix of local and Greek language in the royal court. It is also probable that the issuing officer was of Greco- Bactrian origin. However the use of tithi-lunar month is proof of the absence of indigenously developed Time computation in the Kushana tradition but a liberal borrowing from the Vedic calendar. In this backdrop the year numbers running up to 399 and 384 could only refer to the beginning of their dynasty.  

The month name “Apelaios” in the 17th inscription is also alien to the Vedic calendar. But the tithi of that month appearing in the inscription goes to show that only the month name was altered, and nothing was done about the tithi “Dashahi” (Dasami).


The common features running through all these inscriptions are,

·         No name of the era is found in any of them. They have only recognized a certain beginning and counted the years from that.

·         The blend of Greek names suggests the origin of these kings as different from the Indo-Scythians or the ‘Sacae’ tribes. The location and the language suggest connections with the Yavana tribes, who however appear along with the Śaka-s in Indic references to Mleccha tribes.

·         The Kushana kings appearing in these inscriptions with Greek names indicate a high probability of Yavana- Kushana association in the past.

·         All these inscriptions similar in language (either Brahmi or Kharoshthi) and in the expression of the dates point to a same dynasty, i.e. Kushana.

The common features hint at the Yavana – Kushana connection and the assimilation of the features of the Vedic calendar tradition. Historically too, the Yavana –Kushana connection had existed. A brief historical analysis is done on their beginnings to pick out the relevant connections.

Kushana history

The Kushana origins are traced to the Yuezhi tribes from the valley of Gansu on the northern borders of China who migrated to the north of the Oxus River (Amu Darya). Bactria in this region was earlier lost to the Śaka tribes by the Greeks. The Śaka tribes present at the time of Yuezhi migration were driven out to the south by the Yuezhi. This happened sometime during the 2nd century BCE.

The Khalchayan archaeological complex in that region represents the transition of the Yuezhi into Kushana leadership.[2] The Khalchayan also reveals a “bridge between the Hellenistic art of Bactria and the Hellenized Kushan Art.”[3] After making Khalchayana their base, the Kushanas started moving out. They conquered the south of Oxus and then entered the Indian subcontinent through Afghanistan and Pakistan. The Taxila inscription by Moga could perhaps be the earliest inscription by the Yuezhi-Kushanas.

There is an alternate opinion that Moga was a Śaka king. This is supported by the remaining part of the Taxila inscription stating, “of the Kshaharata and Kshatrapa of Chukhsa - Liaka Kusuluka by name - his son Patika - in the town of Takshasila..” This can also be read as the identity of the donor, Patika, and not the king. All these inscriptions in Kharoshthi and Brahmi indicating donations to Buddhist or Jain establishments, it is probable that the pilgrims of different ethnicities and different locations could have visited Taxila ruled by the Kushanas.

More details are available in the literary sources of the Chinese on Yuezhi migration. According to the Chinese book called “Shiji” (Book of History) authored by Sima Qian, the Yuezhi tribes (mentioned as Da Yuezhi) initially migrated westward from Gansu in China. The defeats they suffered on the way pushed them into Bactria in the north of Oxus in the year176 BCE. A Chinese Ambassador by name Zhang Qian had visited them in the year 129/128 BCE and found them well settled by then.[4] It is more likely that they founded the Kushana dynasty and an era as well sometime between 176 and 129 BCE. According to scholars they had their own language that resembled the Śaka language. The Bactrian influence had lent Greek words into their vocabulary. This is reflected in the inscriptions found in the Indian sub-continent.

There are diverse opinions among western scholars on the number of eras deduced from Yuezhi – Kushana coins and inscriptions. Upto three different eras are hypothesized by them, but all of them are unsubstantiated. This uncertainty added to the confusion of those working on the date of the Siddhantic works which can never refer to an era outside the Kali era format.

The unspecified “Old Śaka” seen in the above inscriptions can be resolved through another literary source – an astrological text of the Yavanas. This text written in Sanskrit and titled as “Yavana Jataka” refers to only one era of the Kushanas besides referring to an era of the Yavanas. It also gives a conversion formula between the Kushana and Yavana years. This greatly helps in solving the mystery of the so-called “Old Shaka” and also to prove that it has no connection with the Siddhantic references to the Śaka years.

The Era of the Yavanas

The Yavana Jataka is an astrological text of horoscopy written in Sanskrit. Two authors are recognized in the colophon of the text in its last chapter. The text was composed by Yavaneswara or Yavanacarya in his native tongue and was made into Sanskrit by the King Sphujidhwaja. An alternate version exists in Bhattotpala’s commentary to Brihat Jataka that both are the same.

In the last chapter of Yavana Jataka the author makes significant references to the Yuga of the Yavanas and the Śaka of the Kushanas .

The Yavanas had a great Solar Yuga and a Smaller Yuga for predicting eclipses.[5] The Yavanas had followed a Yuga of 165 years. While stating this it is also told that some Yavanas find it good to follow the opinion of sage Vasishtha, but according to the best of the Yavanas the Yuga consists of 165 years![6]

The reference to Vasishtha reminds us of the earlier occasions the Yavanas were saved from Sagara by Vasishtha and the Yavanas coming to fight on behalf of Vasishtha against Vishwamitra to restore the sacred cow. The Yavanas seemed to have enjoyed cordial relationship with the lineage of the Vasishtha-s and at some point of time received the knowledge of astrology from one of the Vasishtha-s. By the time of the composition of Yavana Jataka, parallel development of astrological theories seemed to have taken place. A major theory seems to be the idea of the Solar Yuga of 165 years. This is something unheard of anywhere in the world.

Yavana Jataka continues to describe the marker for this Yuga.

This solar Yuga begins on the first tithi in the Sukla paksa of Caitra in the Spring, when the Sun and the Moon in their course are in conjunction in the first degree of Aries and when Aries is in the ascendant (i.e., at dawn).”[7]

The conjunction of all the planets except Rahu at the beginning of Aries marked the beginning of Kali Yuga. In contrast the Yavana Yuga started at the conjunction of only the sun and the moon at the beginning of Aries with Shukla Pratipat running at sun rise.

This implies that the sun entered Aries on the day after Amawasya in Caitra. This close conjunction of the two luminaries at Caitra Shukla Pratipat in the beginning of Aries can happen in Nija masa, with the previous month being Adhika Caitra.  Adhika Caitra can recur once in 15 to 17 years on an average.  

There is another rider implied by the verse. The conjunction at the beginning of Aries means that the star Aswini was transited by both the sun and the moon.

Additionally one more feature is given in the same text (quoted below), pertaining to the week day. It was a Sunday when the Solar Yuga of 165 years began.

Thus there are four features:

1.      Caitra Shukla Pratipat

2.      Aswini

3.      Sunday

4.      165 year cycle.

Of these four, the conjunction of the first three can happen only once in 1890 years (LCM of 30 tithis, 27 stars and 7 week days).This number can be more if Adhika masa occurrence is included.

Each cycle starting every165 years, the probability of this conjunction is stretched to 20,790 years. (The LCM of 30, 27, 7, 165 = 20,790)

At best the subsequent cycles (of 165 years) could have started at Caitra Shukla Pratipat. This is the same as the Yugādi observed in South India every year. The unique date of the conjunction of the four factors was grabbed by the Yavanas to herald a new Yuga of their own.

Yavana Jataka further states the number of elapsed years of the Śaka when the Solar Yuga began.[8] Sunday as the first weekday of the Yuga is stipulated in this context. Let me reproduce the verse along with two translations. [9]

 

The verse clearly states the beginning of Ravir Yuga (the Yuga of the Sun) on a Sunday (Surya Dina). The confusion comes in the number of elapsed years, whether it is 66 or 56. Number 56 is more acceptable as half of hundred (50) and six.

The main issue is the “idam Śakānām” of the elapsed years.

Idam: this

Śakānām: of the Śaka (Plural, 6th case)

Fifty six years of “this Śaka” were gone when the Ravi Yuga started at the conjunction of the sun and the moon at the beginning of Aries on a Sunday when Shukla Pratipat was running – this is the import of the verse.

The first year of the Śaka – the first year of Ravi Yuga = 56 years. 

The identity of this Śaka is variously debated, with many writers referring to the Shalivahana Śaka of 78 CE. But in the absence of even a suggestive reference to an outside era such as Shalivahana or Vikrama anywhere in the text that is totally devoted to the astrology of the Yavanas, we are led to treat this as the Śaka of the Yavanas. If it is a Vedic Śaka, the author would have indicated as he did when he quoted Vasishtha’s name to clarify that the Yuga of the Yavana was different.

To decipher the date of the Yavana Śaka we have to find out the Ravi Yuga beginning. I checked Jhora astrological software to locate the date of Ravi Yuga when the sun and the moon joined at the beginning of Aries on a Sunday at the time of Shukla Pratipat. It threw up the biggest surprise. The date was close to Caitradi Vikrama Śaka! Since the Yavanas were located north-north west of India, I had taken up Srinagar for checking the date.

The starting date of Ravi Yuga of the Yavanas

All the features mentioned in Yavana Jataka are fulfilled in this date.

·         Aries lagna

·         Sun- Moon conjunction with the sun having just entered Aries

·         Caitra Shukla Pratipat

·         Sunday

As expected Nija Caitra began on that day. This date coincided with Vikrama Śaka at Kali 3045, a year later than the originally devised Vikrama Śaka date. This was discussed in the last part where I showed the rationale of Kartikadi Śaka of Vikrama in the year 57 BCE after the lapse of 3044 years of Kali Yuga. By Caitra of 56 BCE, a year was gone in Vikrama Śaka of 135 years. That year was taken as the first year of Ravi Yuga by the Yavanas considering the once-in-twenty thousand year plus conjunction.

The rarity of the date explains why the Yavanas had two time scales, a Śaka era and Ravi Yuga. They had originally conceived the Śaka era. Nearly half a century later they must have witnessed the Vedic people gearing up for the change of their Śaka from Yudhishthira to Vikrama. Unfortunately the Vedic people seemed to have been caught in a dilemma on the choice of the starting date between Caitra Shukla Pratipat on 57 BCE when Yudhishthira Śaka formally ended at Kali 3044 and the same tithi of the next year (56 BCE) with alignment of the Sun and the moon as they were at the beginning of Kali Yuga. They settled in between the two on the day of Tula Sankramana in 57 BCE having the conjunction of many features.

The 56 BCE date was available up for grabs by the Yavanas who in spite of having started a Śaka era by then, chose to make it part of their time scale by starting a new Yuga from then onwards.

Fifty six years of the Yavana Śaka were gone by then when this Yuga was started. This locates the beginning of the Yavana Śaka at 112 BCE (56 years before 56 BCE). Therefore “idam Śakānām” in the verse cannot be about Vikrama Śaka or Shalivahana Śaka but a Śaka of the Yavanas.

Further evidence for this Śaka of the Yavanas appears in the next verse. Before going over to that let me clarify two features, one about the simulation used for locating the Yavana Yuga and the other about Bhattotpala’s reference to a Śaka when Sphujidhwaja composed his work.

Jhora Surya Siddhanta works for dates closer to zero ayanamsa

The Ravi Yuga date could be derived only from the Surya Siddhanta astronomy and not from any other system.

No researcher could get this Ravi Yuga right mainly because they had used western astronomy based calculations which work on standard approximations for past dates. But the date of the Yuga coming closer to zero degree ayanamsa, I checked with the Surya Siddhanta model and it concurred perfectly.[10] For comparison, let me show the same date for Lahiri ayanamsa, based on current rate of precession approximated to 2000 years ago, almost in the same way the western astronomy calculations are made.

Simulated to Lahiri ayanamsa

The tithi had changed though it was a Sunday. But the sun was in Pisces, away from Aries by 4 degrees. It would take four days for the sun to reach Aries but by then the moon would have entered Taurus and the tithi would have advanced. No other year comes closer to the required parameters. This is a very clear proof of unworkability of Lahiri ayanamsa beyond a few centuries in the past.

Bhattotpala on Śaka of Sphujidhwaja.

Bhattotpala in his commentary to verse 7-9 of Brihat Jataka has referred to a “Śaka” when Sphujidhwaja made his compositon (Yavana Jataka). He has written,

 “evaṃ sphujidhvajakṛtaṃ śakakālasyārvāg jñāyate

Meaning:

evaṃ = thus, so, really

sphujidhvajakṛtaṃ = done by Sphuji Dhwaja

śakakālasya  = of saka kala

arvāk = near, within,

Jñāyate = is known, are understood

Let me reproduce the meaning of arvāk – the crucial word to understand the verse.

Sphujidhwaja had done a work (Yavana Jataka) close to a Śaka era, is the overall meaning.

The identity of the Śaka era mentioned here is a matter of debate.

If Bhattotpala had meant the Yavana Śaka, it means Yavana Jataka was composed close to the beginning of the Śaka, i.e. 112 BCE. The gap between Yavana Śaka and the Yavana Yuga is too huge to be treated as ‘arvāk’.

Considering the details of Ravi (Yavana) Yuga described in Yavana Jataka more or less on the lines of Vedanga Jyothisha, Yavana Jataka seemed to have served as the rule book for the Ravi Yuga. In all probability Yavana Jataka must have been composed close to the beginning of Ravi Yuga, i.e. just before that – outlining the details of that Yuga.

This notion is supported by the fact that the details of the Ravi Yuga appears only in the last chapter, as a kind of addendum. Any earlier Yavana writer, say, Yavanacarya recognized in the text could not have conceived the Yavana Yuga. This also rejects Bhattotpala’s version that Yavanacarya and Sphujidhwaja were the same. Sphujidhwaja had Sanskritized an earlier text of Yavanacarya and added a chapter on Ravi Yuga.

It must have been completed before the Ravi Yuga started in Caitra 56 BCE. At that time the nearest Śaka was Vikrama Śaka, not the Yavana Śaka which was 56 years away. With the Yavana Yuga starting too close to the Vikrama Śaka there is scope to interpret that Bhattotpala meant Vikrama Śaka only. It is logical to expect anyone to remember or relate the development of a new astrological system of an alien group in one’s own calendar date. Bhattotpala had recorded that memory handed over through generations.

The Kushana Era.         

After stating the start of the Ravi Yuga, Sphujidhwaja goes on to give a formula to derive the elapsed years in the Ravi Yuga for the corresponding Kushana years.[11] The existence of the Kushana Era is made known from this.

Take the number of years that have passed of the Kosanas, add 149, and subtract from this (sum) the time of the Sakas (i.e., the year in the Saka era); (the remainder) is the number of years in the yuga which have elapsed.”

The verse speaks about the Kushana (Śaka) years and a Śaka besides the Yuga of the Yavanas. Taken along with the previous verse, the Śaka is understood to be that of the Yavana (112 BCE).

The verse gives a conversion formula between the Kushana years and the Ravi Yuga years using the Śaka years.

The known factors are:

·         Yavana Śaka started in 112 BCE

·         Yavana Yuga started in 56 BCE

·         There is a gap of 56 years between Yavana Śaka and Yavana Yuga.

Deduction of Yavana Śaka years from a constant number 149 added to the Kushana years shows that the Kushana Era was older than the Yavana Śaka.

I attempted to write down the verse into a formula as follows:

Let us assume the elapsed Kushana years as X.

{X (number of Kushana years elapsed) + 149} – Years of Yavana Śaka = Years of the Yavana (Ravi) Yuga elapsed.

Taking up the known factors written above, I substituted 56 as the number of Yavana Śaka years when the Yavana Yuga was born. Yavana Yuga year is then taken as zero.

X + 149 – 56 = 0

X + 93 = 0

X = 0 – 93 = -93

This negative integer puts us in a spot, but this number being the elapsed years of the Kushana Śaka, when the Ravi Yuga of the Yavanas had just begun it can be taken as the number of Kushana years gone before the Yavana Yuga was started. 

In modern calendar years, Ravi Yuga = 56 BCE

By adding 93 years to that we get the first year of the Kushana Śaka = 149 BCE   (-56 (+) -93).

Kushana-Yavana Eras and Ravi Yuga

When I tested with different number of elapsed years the result was not consistent. With the verse conveying a relationship between the Kushana and the Yavana Śaka it appears that it was meant to be a formula for deriving the first year of the Kushana Śaka. Any other derivations and explanations from readers are welcome.

However we cannot miss out the fact that the derived date (149 BCE) remarkably matches with the beginning of Kushana dynasty.

On the basis of the Chinese book of Shiji, we earlier derived that the Kushana Dynasty was formed sometime between 176 and 129 BCE. The now derived date of Kushana Śaka at 149 BCE is well within this period. The literary, archaeological (Khalchayan) and astrological derivations are concurrent with each other on the date of the Kushana Śaka with the astrological input giving the exact date.

The Śaka dates derived so far are listed below:

Yudhishthira Śaka = 3101 BCE (Vedic)

Vikrama Śaka = 57 BCE (Vedic)

Yavana Yuga = 56 BCE

Yavana Śaka = 112 BCE

Kushana Śaka = 149 BCE

Our search for the Old Śaka ends at the last two which were not Vedic, but used by the people in the domains occupied by the Yavanas and Kushanas.

It is erroneous to term these two as Old Śaka-s. They were Mleccha Śaka-s as far as Vedic, particularly the Siddhantins were concerned. A Jyothisha Siddhanta can never declare the date of composition from a Mleccha Śaka. As such Bhaskara II could have never taken any of these Śaka-s of Mlecchas to specify the date of composition. We would discuss that in the course of debunking such claims by scholars. Meanwhile our next task is to establish the identity of the Śakakāraka of Shalivahana Śaka.

(To be continued)



[2] Hans Loeschner, “Notes on the Yuezhi – Kushan Relationship and Kushan Chronology” https://www.academia.edu/9062261/Notes_on_the_Yuezhi_Kushan_Relationship_and_Kushan_Chronology

[3] Kazim Abdullaev, “Nomad Migration in Central Asia” https://www.academia.edu/6864202/Nomad_Migration_in_Central_Asia

[4] Hans Loeschner, “Notes on the Yuezhi – Kushan Relationship and Kushan Chronology”

[5] Yavana Jataka: 79-2

[6] Yavana Jataka: 79 - 3

[7] Yavana Jataka: 79-4

[8] Yavana Jataka: 79-14

[9] Bill M.Mak,  “The Date and Nature of Sphujidhvaja’s Yavanajātaka Reconsidered in the Light of Some Newly Discovered Materials”

http://www.billmak.com/wp-content/uploads/2013/04/the-date-and-nature-of-sphujidhvaja.pdf

[10] Zero ayanamsa years in Surya Siddhanta Model: 3101 BCE, 499 CE

[11] Yavana Jataka: 79-15

2 comments:

Snehal Trivedi said...

Namaskaram mam..
Very nicely deciphered and detailed by you..
I want to know that how can we apply 5 year yuga cycle for the present day situation..
For present time sun and moon conjunction occurs around every 8 years on chaitra shukla pratipat and Uttarayana..
And if we calculate from 3101 BCE which samvatsara we need to recite in the Sankalp Mantra..
Kindly guide for that..

Jayasree Saranathan said...

@ Snehal Trivedi

Namaskaram.

Thank you for appreciation.

I don't think it is right on our part to apply or start 5 year Yuga for the current times.
Ever since the winter solstice slipped backward of zero degree of Capricorn, the Vedic society had stopped recognizing the new dates of Uttarayana in Sagittarius.
If true position of Uttarayana can not be recognized how is it possible to revive the 5 year yuga system?
Better to follow what is handed down - that is the current scale.

The current scale is Kali Yugaadi starting from Aries whereas the 5 year Yuga starts at Uttarayana. These two come with their own Devatas and Phala-bhaga and so can not be mixed with. The sankalpa mantras as they exist now incorporate Kalpa-manvantara-Yuga whose rationale is explained in the last paragraph in this article https://jayasreesaranathan.blogspot.com/2018/01/divya-and-dharma-two-sides-of-yuga_19.html

With total absence of knowledge of the sankalpa mantras of the 5 year yuga system and complete lack of mental evolution on our part it is dangerous and also an affront on Dharma to even attempt to infuse something new on our own.

On the other part of your comment,
the sankalpa mantras refer to 'samvatsara' as the year and not era.
We do state the samvatsara (year) name in sankalpa mantras.
Those in the south of Vindhyas follow Prabhavadi cycle in which "Plava" is the current samvatsara from caita 2021 to next caitra.

Those in the north of Vindhyas follow the cycle starting from Pramathi in which the current samvatsara is Paridhavi.

The variation in Pramathi and Prabhava is found to be a proof for Kali Yuga at 3101 BCE. The north retained the continuing cycle whereas the South chose to re-set the clock (cycle) by starting from the first year of the cycle for the 1st year of the Kali Yuga.