Kindly request to provide answers for adiyen’s queries below related to aradhanam, tharpanam, etc. One of the divine names in the Sri Mahalakshmi Ashtohra Namavali is ‘sri bilva nilayAya namaH’. Vilvam (Bilvam) the sacred tree is associated with Thayar. This being so, why is Vilvam usually offered to Shivaperuman? Why is not offered to Perumal? It is also said that Vilva leaves are offered to Srinivasa Perumal at Thirumala during Dhanur maasam. Why is it offered only during Dhanur maasam? According to the English calendar, the next day (a day) starts at midnight. Given this, during a Dhanur masa aradhanam that is done before sunrise, what day (E.g. bhAnu vAsara) must be mentioned during sankalpam? Is it based on the day as per the English calendar or the previous day? As the taligai is offered before sunrise, must we recite ‘satyam tvadartEna parishinchAmi’ or ‘rutam tvA satyEna parishinchAmi’? Which star (nakshatram) is associated with Dhanvantari Perumal? In which tithi or star must we perform aradhanam for Dhanvantari Perumal? vyatIpAta yogam, one of the 27 yogas, is said to be malefic and is suitable only to perform karmas related to Devas and Pitru-s. As a result, during vyatIpAta yogam period, must any specific Perumal aradhanam/Japam/Dhanam be done? As per the shloka below, what is the relation between the vyatIpAta yoga kalam and ‘cakra svarUpAya’? vyatIpAta mahAsatva sarvapApapraNAshana sahasrabAhO vishvAtman gruhANArkyam namOstu tE | vyatIpAta namstEstu namaste vishvamangala vishNucakrasvarUpAya namaste divyathEjasE || In America, this year Makara Ravi came into being at 4.15 PM. Adiyen could not fast until 4.15 PM to perform tharpanam. As a result, performed the tharpanam the morning of the next day before partaking food. In such instances where Makara Ravi’s advent is in the evenings, can one partake food before tharpanam, or must one perform tharpanam before partaking food?

Vilvam can be offered to Perumal. It is known that it will not be a misdemeanor since ‘bilva nilaiyAya namaH’ is towards Thayar. So it can be offered to Perumal. Because offering Vilvam to Shivan is considered special, they do so.
The question itself mentions that Vilvam leaves are offered to Srinivasa Perumal at Thirumala during Dhanur maasam. Hence it means that Vilvam can be offered to Perumal. What is the special reason that it is only offered during Dhanur maasam at Thirumala must be queried around. Whatever the reason, Vilvam can be offered, and let us accept that it can be offered during the Dhanur maasam.
Since Pongal is generally offered during the Dhanur masa aradhanam, and because it is a salted preparation, parishesanam is not applicable for that. Without parishesanam, Pongal can be offered after shosanam and plavanam as purificatory rites.
There is an ancient Sannidhi for Dhanvantari at Srirangam temple. In that Sannidhi, Dhanvantari Jayanthi is celebrated during the month of Aippasi and on Hasta nakshatram. We can follow the same.
Srivaishnava-s need to perform any aradhanam, japam, dhanam, etc. that is mentioned in the vyatIpAtayogam. It includes several karma-s for material benefits (kAmya karmA). We have been told not to perform any rituals for material benefit.
Adiyen is not aware of where the shloka that starts with ‘vyatIpAta mahAstava’ is. Many meanings can be said for ‘vyatIpAta’ – it could also mean ‘One who transcends everything’. Maybe because of this meaning the association could be construed. It would be convenient for adiyen if you could point out whether it is vyatipAt1a or vyatipAd3a in the shloka. Adiyen is also asking several others about this.
Usually, one must not partake food before tharpanam; tharpanam must be done only on the day of masa pirappau. The following day is not a punya kalam. Because of this, if one is unable to wait until the appropriate time for masa pirappu tharpanam, one could do the tharpanam a little earlier and partake food. Even if this is not possible, as asked in the question, one must avoid performing tharpanam after partaking food or the following day.