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National Events:Historical Events on April 1:
International Events:- 1578: William Harvey of England discovered blood circulation.
- 1850: San Francisco County Government established
- 1867: International Exhibition opened in Paris.
- 1889: First dishwashing machine marketed in Chicago.
- 1900: First edition of Dutch newspaper ""The People"" was published.
- 1924: The Royal Canadian Air Force was formed.
- 1960: The TIROS-1 satellite transmitted the first television picture from space.
- 1878: Calcutta Museum was opened.
- 1882: Savings Bank Postal system was introduced.
- 1895: Indian Army was established.
- 1912: The capital of India was moved from Calcutta to New Delhi.
- 1933: Indian Air Force was established.
- 1935: The Reserve Bank of India was established as a Central Bank of India.
- 1936: Orissa state was formed as a province of British India separating from Bihar.
- 1962: Maharashtra State Finance Corporation was started.
- 1969: India's first Atomic Energy Reactor was started in Tarapore.
- 1976: Doordarshan Corporation was established.
- 1987: Bureau of Indian Standards was changed to the Indian Standards Institution.
- 1993: National Aeronautical Laboratory became the National Aerospace Laboratories.
- 1995: Airports Authority of India was established.
Days Observed on Apri 1:
- National Civil Service Day: Thailand