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The Collaborative International Dictionary
Discovery Day

Discovery Day \Dis*cov"er*y Day\ same as Columbus Day, above.

Discovery Day

Columbus Day \Co*lum"bus Day\ The 12th day of October, on which day in 1492 Christopher Columbus discovered America, landing on one of the Bahama Islands (probably the one now commonly called Watling Island), and naming it ``San Salvador''; -- called also Discovery Day. This day is made a legal holiday in many States of The United States.

Wikipedia
Discovery Day

Discovery Day is the name of several holidays commemorating the discovery of land, gold, and other significant national discoveries.