Kathiri Veyil is the period when the Sun or Surya passes
through the star Krittika also known as Agni Nakshatram. The period is
considered to be the peak summer season. In 2025, Kathiri Veyil in Tamil
Calendar is from May 4 to May 28. As it is the peak summer season the period is
considered inauspicious and therefore some people refer the period as Agni
Nakshatra dosha. The period is also known as Kathir and Kartari.
The passing of sun through 3rd and 4th quarter of Bharani
Nakshatra and the four quarters of Krittika and the first quarter of Rohini
Star is the period of Agni Nakshatram.
The dosha or inauspicious period is for 21 days. The popular
belief is that journey made during this period will be unsuccessful, money
given will not be returned, diseases will not be cured easily etc.
Some people are of the belief that auspicious events were
avoided in ancient times during this time due to the intense heat wave taking
place during the period.