We all know the names of 12 tamil months. Let me also give its sanskrit equivalents and why the months are named like this. This is a simple one and can be guessed by anyone. The full moon day or pournami will fall on a particular star and accordingly the month is named. (Source: Deivathin kural)
read as tamil month - sanskrit name - star (sanskrit name of star) on which pournami falls
Chithirai - Chaitra - chitthirai (chaitra)
Vaikasi - Vaishaka - vishakam (vaishaka)
Aani - Jyeshta - kettai (jyeshta)
Aadi - Aashada - pooraadam (poorvaashada) or uthraadam (uthraashada)
Aavani - Shraavana - tiruvonam (shravanam)
Purattasi - Bhadrapada - poorattadhi (poorva proshtapadha) or uthrattadhi (uthra proshtapadha)
Aipasi - Ashwina - aswathi (ashwini)
Karthikai - Kartika - karthikai (Karthika)
Margazhi - Margashirsha - mirugaseersham (mrugaseersha)
Thai - Pausha - Poosam (pushyam) or punarpoosam (punarvasu)
Maasi - Maagha - Magam (magam)
Panguni - Phalguna - Pooram (poorva phalguni) or uthram (uthra phalguni)
The twenty seven stars or nakshatras for reference - ashwini, bharani, karthikai, rohini, mrigaseersha, tiruvadirai, punarpoosam, poosam, aayilyam, magam, pooram, uthram, hastham, chithirai, swathi, vishakam, anusham, keettai, moolam, pooraadam, uthraadam, tiruvonam, avittam, sadhayam, poorattadhi, uthrattadhi, revathi.
If we see, these days on which pournami falls will be a festival time. Chitra pournami, vaikasi vishakam, guru poornima, karthikai, tiruvadirai (margazhi month), thai poosam, maasi magam, panguni uthram and so on.
read as tamil month - sanskrit name - star (sanskrit name of star) on which pournami falls
Chithirai - Chaitra - chitthirai (chaitra)
Vaikasi - Vaishaka - vishakam (vaishaka)
Aani - Jyeshta - kettai (jyeshta)
Aadi - Aashada - pooraadam (poorvaashada) or uthraadam (uthraashada)
Aavani - Shraavana - tiruvonam (shravanam)
Purattasi - Bhadrapada - poorattadhi (poorva proshtapadha) or uthrattadhi (uthra proshtapadha)
Aipasi - Ashwina - aswathi (ashwini)
Karthikai - Kartika - karthikai (Karthika)
Margazhi - Margashirsha - mirugaseersham (mrugaseersha)
Thai - Pausha - Poosam (pushyam) or punarpoosam (punarvasu)
Maasi - Maagha - Magam (magam)
Panguni - Phalguna - Pooram (poorva phalguni) or uthram (uthra phalguni)
The twenty seven stars or nakshatras for reference - ashwini, bharani, karthikai, rohini, mrigaseersha, tiruvadirai, punarpoosam, poosam, aayilyam, magam, pooram, uthram, hastham, chithirai, swathi, vishakam, anusham, keettai, moolam, pooraadam, uthraadam, tiruvonam, avittam, sadhayam, poorattadhi, uthrattadhi, revathi.
If we see, these days on which pournami falls will be a festival time. Chitra pournami, vaikasi vishakam, guru poornima, karthikai, tiruvadirai (margazhi month), thai poosam, maasi magam, panguni uthram and so on.