Wikipedia:Àwọn Ìṣẹ̀lẹ̀ Bíi Ọjọ́ Òní/Ọjọ́ 21 Oṣù Kẹ̀wá
- 1983 – The mita is defined at the seventeenth General Conference on Weights and Measures as the distance light travels in a vacuum in 1/299,792,458 of a second.
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- 1833 – Alfred Nobel, Swedish inventor and founder of the Nobel Prize (d. 1896)
- 1917 – Dizzy Gillespie, American jazz musician (d. 1993)
- 1931 – Shammi Kapoor, Indian actor (d. 2011)
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