Dashed left edge = started before April 1999 ·
Dashed right edge = ongoing beyond April 1999
Events in April 1999 6
1999First Multi-Planet System Found Around a Sun-like StarUpsilon Andromedae confirmed to host three planetsAstronomers announced in April 1999 that the star Upsilon Andromedae hosts at least three planets, making it the first known multi-planet system orbiting a Sun-like star other than our own. The discovery supported the idea that planetary systems are common in the galaxy. It was based on radial velocity measurements gathered over several years.
1999Nunavut Becomes Canada's Third TerritoryNew territory carved from the Northwest TerritoriesNunavut was formally established as a separate Canadian territory on April 1, 1999, following a land claims agreement with the Inuit. It is Canada's largest territory by area and has a majority Inuit population. The creation of Nunavut was the largest change to Canada's map since 1949.
1999 – 2001WTO Negotiations and EntryLed years of negotiations with the United States and other nations that culminated in China's entry into the World Trade Organization in December 2001. The agreement opened China to global trade and helped trigger the country's explosive economic boom of the 2000s.
1999Duke Ellington awarded a posthumous PulitzerSpecial CitationA Pulitzer that had been denied to him in 1965.
19991999 World Snooker ChampionshipHendry’s SeventhStephen Hendry wins a record-breaking seventh title. Winner: Stephen Hendry; Runner-up: Mark Williams. Score: 18–11.
1999Columbine High School MassacreSchool shooting in Colorado kills thirteenTwo students at Columbine High School in Littleton, Colorado, killed twelve students and one teacher before killing themselves. The attack became a defining reference point for school shootings and gun control debates in the United States. It prompted widespread changes to school security policy nationwide.