Portal:Anniversaries/August 21
- 1965 — American astronauts L. Gordon Cooper, Jr. and Charles Conrad, Jr. wear Omega Speedmaster watches while orbiting the earth 120 times in 9 days aboard the Gemini V spacecraft
- 2018 — Patrick Pruniaux becomes CEO of Girard-Perregaux, moving from Ulysse Nardin and replacing Antonio Calce