Leap Years: we can do better
Julian calendar, source of 12 months, leap year and more!
The Leap Year as Explained by Neil deGrasse Tyson | StarTalk
Why Do We Have Leap Years? - An Explanation of the Leap Day and the Julian/Gregorian Calendars
The Julian Calendar: What You Need to Know
Leap years and why we need them - BBC News
Gregorian calendar and Julian calendar - what's the difference?
What's a Leap Year? Calculating on Commodore 64
Neil deGrasse Tyson Explains Why We Have Leap Days
Mathematics behind Leap Year Calculation | History of Leap Years | September 1752 | SuMyPyLab
A Short History of the Modern Calendar
Why Do We Have LEAP YEARS? | What Is A LEAP YEAR? | The Dr Binocs Show | Peekaboo Kidz
How Was The Calendar Invented?
Calendar History
How Britain and America LOST 11 DAYS | Gregorian calendar explained | Julian calendar explained
Why Do Some Countries Use Different Calendars?
The Jewish Calendar, Explained
The Phantom Time Hypothesis | 300 Years ARE MISSING from the Calendar
Why Do We Have Leap Year? (And When it Doesn't Happen) | Explained
13 months, our calendars are wrong