New Hampshire Astronomical SocietyJune 15th in Astronomy and Space Science
 | 1903 | American astronomer Edward Emerson Barnard observes a white spot on Saturn. It is later determined that this massive storm, three times the size of the Earth, occurs about every 30 years. This interval coincides with summer on Saturn's northern hemisphere. |
 | 1985 | The Soviet Vega 2 spacecraft lands on Venus. The probe also included a Comet Halley fly-by package which separated while enroute to Venus. |
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