PM Modi pays tribute to Pandit Nehru on his birth anniversary .
"Tributes to Pandit Jawaharlal Nehru on his birth anniversary," the prime minister tweeted .
Former prime minister Manmohan Singh and former president Pranab Mukherjee also paid homage to Pandit Nehru at his memorial Shantivan .
Pandit Nehru was sworn-in on August 15, 1947 as the first prime minister of India when the nation gained independence from the British .
He was born on November 14, 1889 in Uttar Pradesh's Allahabad and died on May 27, 1964 .
Pandit Nehru's birth anniversary is celebrated as Children's Day across the nation .
Pandit Nehru had joined the Indian National Congress (INC) in 1919 and later, joined Mahatma Gandhi in the independence movement . He became the general secretary of the All-India Congress Committee (AICC) in September 1923 .
In office until his death, Pandit Nehru remains India's longest-serving prime minister . (ANI)