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The Rattanakosin Bicentennial (พระราชพิธีสมโภชกรุงรัตนโกสินทร์ ๒๐๐ ปี,, lit. 'Royal ceremonies of the Rattanakosin bicentennial') was a series of ceremonies, festivals, and observances that were celebrated on 6 April 1982, which commemorated the 200th anniversary of the foundation of, in 1782, the new Siamese capital of Rattanakosin, i.e. Bangkok, in Rama I.

Programmes
The king endorsed the royal programmes during the period of April 1982 as follows: