Someone recently mentioned to me that Mahaperiyava took sanyasa on Akshaya Trithiyai. I wasn’t sure about the authenticity of that. I did long back (https://mahaperiyavaa.blog/2011/03/15/key-milestones-from-mahaswamigals-life/). I pages I posted was taken from a magazine Sri Matam had printed long back – clearly, that is an authentic one. Becoming a sanyasi is different from becoming the acharya swami of Kamakoti Peetam. As per the following are the text from “Mahaperiyava Divya Charitham”, they both happened on the same day.
Swaminathan was later formally initiated into the sannyas ashram. This holy event took place on the second Wednesday of the lunar month of Maasi, in the Prabhava year (February 13, 1907) when he was just 13 years old. He took the name of Sri Chandrashekarendra Saraswathi and became the 68th Shankaracharya to grace the Sri Kamakoti Peetam.
Obviously the month when He took sanyasa was Feb and normally Akshaya tritiyai comes in April. Also interestingly the star is not Mulam on that day (as per mypanchang.com – click for 1900 to 2006). As you are aware, mypanchang has become the only source to have panchangam all the way from 1900 to date. Actually Feb 9th was mulam. I am just wondering how Mula Nakshatram is associated with this.
Here is the screenshot of mypanchang from 1907 February:

Here is the Matam panchangam shared by Sri Thangasubramanian. Even as per this, it is not mulam.
Finally – here is Sharmaji quoting completely a different date – I am sure he is saying this based on certain facts (I don’t know which one – will try to find out from him)
It is only an observation and trying to clarify my mind – nothing more.
Periyava Sharanam!