On which date did the document Aarti is looking at come into effect?

NCERT (2026-27): “Framing the Constitution The Beginning of a New Er TWELVE
The Indian Constitution, which came into effect on 26 January 1950, has the dubious distinction of being the longest in the world. But its length and complexity are perhaps understandable when one considers the country’s size and diversity. At Independence, India was not merely large and diverse, but also deeply divided. A Constitution designed to keep the country together, and to take it forward, had necessarily to be an elaborate, carefully-worked-out, and painstakingly drafted document. For one thing, it sought to heal wounds of the past and the present, to make Indians of different classes, castes and communities come together in a shared political experiment. For another, it sought to nurture democratic institutions in what had long been a culture of hierarchy and deference.”