In India, Republic Day honours the date on which the Constitution of India came into force–on 26 January 1950–replacing the Govt. Of India Act (1935) as the governing document of India. It is one of three National Holiday in India. The new constitution, as drafted and approved by the Constituent Assembly of India, was mandated to take effect on 26 January 1950–and India became a republic.
Thai Pongal (தைப்பொங்கல்) or Pongal (பொங்கல்) is a harvest festival celebrated by Tamils at the end of the harvest season. It is one of the most important festivals celebrated by the Tamils in the Indian state of Tamil Nadu, the Indian Union Territory of Puducherry and Sri Lanka.
Pongal marks the beginning of the northward journey of the Sun from
its southernmost-limit, a movement traditionally referred to as uttarayana. It coincides with the festival Makara Sankranthi celebrated throughout India as the winter harvest, and is usually held from January 13–16 in the Gregorian calendar i.e. from the last day of the Tamil month Maargazhi to the third day of Thai.The second of the four days or the first day of month Thai
is the main day of the festival which is known as Pongal or Thai
Pongal. This also represents the Indic solstice when the sun purportedly
enters the 10th house of the Indian zodiac i.e. Makar or Capricorn.