Hindu new years day

[Chandrasekaran, Periannan]

> From: jayabarathi [mailto:jaybee at TM.NET.MY]
> >in ordinary mortals like me the janma nakshatra determines
> >the birthdays.But for avatars the tithi marks the jayanthi.
> >How and why this transformation ?
> >
> >Krish.
> >
>                 Not necessarily so.
>                 We have  Visakha for Murugan.
>                  Purba for Devi.
>

And ONam for tirumAl (viSNu).
One of the pattuppAttu (such as maturaikkAJci) mentions
something like "the one born on ONam star".

tiruvAtirai star is associated with Sivan but I suppose
not as his birth star since he is called
"piRavA yakkaip periyOn2" or "the greate one who has
the body that was never given birth to"
[cilappatikAram chapter 5-intiravizavur eTuttakAtai?].