![]() ![]() The deviation would grow to exactly 24 hours over 4 years, and Earth would need exactly one day to catch up to the position in its orbit where it was 4 years prior. If the tropical year was precisely 6 hours longer than a calendar year with 365 days, we could use the Julian calendar, which adds a leap day every 4 years without exception. Why Don't We Add a Leap Day Every 4 Years? Leap days give the Earth time to catch up with our calendar. ![]() Leap days fix that error by giving Earth the additional time it needs to complete a full circle around the Sun.Įxact timings for spring, summer, fall, and winter Allow this to happen for a while, and Northern Hemisphere dwellers will be celebrating Christmas in the middle of summer in a matter of a few centuries. ![]() With a deviation of approximately 6 hours per year, the seasons would shift by about 24 calendar days within 100 years. If we didn't add a leap day on February 29 almost every four years, each calendar year would begin about 6 hours earlier in relation to Earth's revolution around the Sun (see illustration).Īs a consequence, our time reckoning would slowly drift apart from the tropical year and get increasingly out of sync with the seasons. However, the Gregorian calendar has only 365 days in a year. This is called a tropical year, and it starts on the March equinox. It takes Earth approximately 365.242189 days, or 365 days, 5 hours, 48 minutes, and 45 seconds, to circle once around the Sun. Leap days keep our calendar in alignment with Earth's revolutions around the Sun. Then it is a leap year.Īccording to these rules, the years 20 are leap years, The year is also evenly divisible by 400. If the year can also be evenly divided by 100, it is not a leap year In our modern-day Gregorian calendar, three criteria must be taken into account to identify leap years: Leap Year Rules: How to Calculate Leap Years What is a leap second? Is 2023 a Leap Year? Leap years have 366 days instead of the usual 365 days and occur almost every four years. This so-called intercalary day, February 29, is commonly referred to as leap day. Leap years are years where an extra day is added to the end of the shortest month, February. Business Date to Date (exclude holidays)Ī common year (non-leap year) is shorter than a tropical year, which is the time it takes the Earth to orbit the Sun. ![]()
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