TNPSC Thervupettagam

World Hydrography Day - June 21

June 23 , 2020 1621 days 875 0
  • It was adopted by the International Hydrographic Organization.
  • The date chosen for this is the anniversary of the founding of the International Hydrographic Organization in 1921.
  • The theme of this year is Hydrography- Enabling Autonomous Technologies.

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