India designated August 23 as 'National Space Day'. Which notable milestone led to this national declaration?

India designated August 23 as 'National Space Day'. Which notable milestone led to this national declaration?
  1. Launch of India's first satellite Aryabhata
  2. Successful soft landing of Chandrayaan-3 on the Moon
  3. Successful orbit insertion of Mangalyaan around Mars
  4. Launch of the astronomical observatory AstroSat

Solution

August 23 was declared National Space Day to commemorate the successful soft landing of Chandrayaan-3's Vikram lander on the lunar surface.

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