Summary
Highlights
The video starts with a family preparing for Granny's birthday, which falls on February 29th, a leap day. This unusual occurrence sparks the question of why February has 29 days in a leap year and 28 otherwise.
Dr. Binocs explains that while we perceive a year as 365 days, the Earth actually takes about 365.25 days (365 days and 6 hours) to revolve around the sun. These extra six hours accumulate over four years, creating an additional 24 hours (a full day) that needs to be accounted for.
The explanation delves into the history of calendars, starting with Romulus, Rome's first king. He created a 10-month lunar calendar with 30 or 31 days per month, totaling 304 days. This calendar was not synchronized with the seasons.
King Numa Pompilius, Romulus's successor, changed the calendar by removing days from even-numbered months due to Roman superstitions about even numbers, resulting in 298 days. To align with 12 lunar cycles, he eventually made the year 355 days. To cover the remaining 57 days, he added two new months, January (29 days) and February (28 days), making February the shortest month.
As time progressed, Emperor Julius Caesar introduced the solar calendar. This calendar moved January and February to the beginning of the year and adjusted month lengths to achieve a total of 365 days. The accumulated extra day from the 6-hour difference was added to February, making it 29 days in a leap year.
The Julian calendar eventually faced issues, becoming 10 days out of sync with the seasons after 1500 years. Pope Gregory XIII then introduced the Gregorian calendar, which we use today, to correct these discrepancies. This calendar accurately accounts for leap years, expected to remain synchronized for approximately 8,000 years.
The video concludes with fun facts, such as approximately four million people worldwide being 'leapers' or 'lieblings' (leap day babies). Another interesting fact is that if January 1st and December 31st of a year fall on different days of the week, it indicates a leap year.