After all, what is a leap year? Why will 2024 be longer than 2023?

The leap year phenomenon still causes curiosity among many people around the world. Understand how our calendar works.

Every four years, our calendar presents a temporal curiosity: the leap year, with the additional day of February 29th. This phenomenon, which adjusts the difference between the solar calendar and the actual time it takes the Earth to orbit the sun.

In other words, it is crucial to keep our temporal organization in harmony with the planet’s natural cycles. In 2024, we will once again have the opportunity to experience this extra day, a tradition that dates back to ancient times.

For some experts, it reflects human ingenuity in measuring time. Continue reading this article to check out all the details of the ‘bonus’ day we will have in 2024.

Understand more about leap year – Credit: Pexels

Leap year: understanding the phenomenon and its impact in 2024

Leap year, which brings us February 29th every four years, is an essential correction to our calendar to align our annual counts with Earth’s orbit around the sun.

In 2024, we will again have this additional date, a peculiarity that adjusts the discrepancy between the solar calendar and the exact time it takes the Earth to complete one revolution around the sun, approximately 365 days and 6 hours.

Why are there years with extra days?

The need for leap years arises from the actual duration of the Earth’s orbit, which is about 365.25 days.

Without adding an extra day every four years, our calendar gradually becomes misaligned with the seasons, affecting everything from agriculture to everyday life.

The extra day in February corrects this discrepancy, ensuring the seasons remain consistent with our dates year after year.

The Legacy of Julius Caesar and Gregorian improvement: curiosities about the Western calendar

The introduction of leap years dates back to the Julian calendar, implemented by Julius Caesar in 46 BC

This system, which introduced the 365-day year and added an extra day in February every four years, was a significant advance at the time.

However, the accuracy was still not perfect, leading to the development of the Gregorian calendar by Pope Gregory XIII in 1582, who refined the system by adding the rule that years divisible by 100 would only be leap years if they were also divisible by 400.

How do you know if the year has an extra day?

The general rule for determining whether a year is a leap year is simple: if the year can be divided evenly by 4, it is a leap year.

However, years ending in "00" are only considered leap years if they can also be divided by 400.

This exception helps correct the small miscalculation accumulated over the centuries.


In addition to keeping our count of time aligned with Earth’s orbit, leap years have significant practical implications.

They ensure synchronization between the calendar and seasons, essential for agriculture, planned events and even to maintain cultural and religious traditions at the right time of year.

Finally, it is interesting to think that even the Western calendar dates back to an ancient culture, which dates back to before Christ. Naturally, over the centuries we perfected the counting of years and days.

Even so, the influence of Greco-Roman habits on modern Western culture is undeniable.

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