Recorded history by calendar date
What happened on October 21?
Explore notable historical events, births, deaths, and observances connected with October 21. This page organizes a useful shortlist from recorded history so the date is easy to scan, cite, and explore further.
Looking for the weekday and calendar conversions too? View October 21, 2026 for the same month and day in the closest available year.
Events
1
Births
0
Deaths
0
Observances
0
היום בהיסטוריה
אירועים מרכזיים, ציוני דרך ונקודות מפנה שקרו בתאריך הזה.
Curated highlights
The shortlist below is ordered to surface the most notable items first while keeping the page readable. When a holiday or observance is relevant, you’ll also see direct links into the related countdown pages.
Historical Events
1879
Edison’s light bulb burns
Thomas Edison’s carbon-filament lamp burned for over 13 hours, proving practical electric lighting.
Births
No curated birth entries are in this shortlist for this date yet.
Deaths
No curated death entries are in this shortlist for this date yet.
Observances / Holidays
No observances are highlighted in the current shortlist for this date.
Why dates can carry multiple meanings
A single month-day can connect political milestones, scientific breakthroughs, notable lives, and annual observances. That is why Whatistheday groups this archive into events, births, deaths, and observances rather than mixing everything into one long timeline.
Some observances are fixed on the same Gregorian date every year, while others move because they follow lunar, lunisolar, or rule-based calendars. For calculation details, see the methodology page.
How long ago?
Curious how many days have passed since iconic moments in history? Browse our Days Since directory — live counters for the Moon landing, the fall of the Berlin Wall, 9/11, and more.
Who was born on October 21?
See famous people born on this date — filterable by footballers, actors, musicians, scientists and more. View birthdays for October 21 →