Why Do We Have Leap Years? - An Explanation of the Leap Day and the Julian/Gregorian Calendars
Neil deGrasse Tyson Explains Why We Have Leap Days
A Short History of the Modern Calendar
The Julian Calendar: What You Need to Know
How Britain and America LOST 11 DAYS | Gregorian calendar explained | Julian calendar explained
How Was The Calendar Invented?
The Leap Year as Explained by Neil deGrasse Tyson | StarTalk
Leap years and why we need them - BBC News
Gregorian calendar and Julian calendar - what's the difference?
The Gregorian Calendar | JRE & Neil deGrasse Tyson
The Julian and Gregorian Calendars
Julian calendar, source of 12 months, leap year and more!
Leap Years: we can do better
Neil deGrasse Tyson - Creation of Gregorian Calendar and Leap Day | Joe Rogan Podcast
A Moment In History: The Gregorian Calendar
Why Do We Have Leap Years?
A Strange History of the Calendar
Why Do Some Countries Use Different Calendars?
Why Do We Have LEAP YEARS? | What Is A LEAP YEAR? | The Dr Binocs Show | Peekaboo Kidz
Why do we have Leap Years? Because of Julius Caesar.