When we were in school it was a great novelty to know, or know of, someone who was born on 29 February. There was much banter and joking about celebrating a birthday only once in four years, and therefore being that much younger than others born in the same year! This was about as much as we knew about the phenomenon that was called Leap Year.
Many leap years later, when I realized that this Thursday happens to be the 29th of February, curiosity prompted me to dig a little deeper into the why and how of Leap Years.
My first discovery was that there was a fair amount of solid science, as well as history, behind how this extra day came to be added to the calendar every four years.
A regular calendar year as per the Gregorian calendar that is most widely followed, normally has 365 days. This is an approximation of time that it takes the Earth to orbit the sun. In reality it takes approximately 365.25 days (more precisely 365 days, 5 hours, 48 minutes and 46 seconds) for Earth to complete a full orbit around the sun. It would be hard, practically, to add a quarter of a day into a calendar every year. Thus while we follow a 365 day calendar for three years, the quarters add up to a full day every fourth year, which is when the extra leap day is added to February, the shortest month of the calendar, making it a 29-day month. In other words, leap years keep the calendar lined up with the Earth’s actual orbit.
This addition is important because it helps to adjust the Gregorian calendar to the solar calendar, so that we remain in sync with the seasons, marking the spring and autumn equinoxes at the same time each year. Put simply, these additional 24 hours are built into the calendar to ensure that it stays in line with the Earth’s movement around the sun. If this difference was not accounted for, then every year the gap between a calendar year and a solar year would widen by over five and a half hours, and over millennia it would shift the timing of the seasons. It has been calculated that in around 700 years the summer in the Northern Hemisphere would begin in December instead of June.
In other words, the insertion of an extra day is rooted in a complex combination of time-keeping, astronomy and their alignment through mathematics. Interestingly, the insertion of days in a calendar, (known as intercalation) has been tried across civilizations, in an attempt to ensure compatibility between that the lunar and solar schedules, so as to maintain consistency with the seasons. The ancient Egyptian calendar was composed of twelve 30-day months with 5 days appended at the end of every year. In the Chinese calendar, an extra month is added every three years when a “double spring” is celebrated. In the Hindu and Hebrew calendars also, a month is added every three years or so, following the moon’s 19-year cycle of phases.
And then of course is the addition of the “leap day” in the Gregorian calendar every four years. But why the name “leap day” and “leap year?”
The name “leap” comes from the fact that from March onward, each date of a leap year moves forward by an extra day from the previous year. Normally, the same date only moves forward by a single day between consecutive years. For example, March 1, 2023 was a Wednesday, and in a normal year, it would fall on a Thursday. But in 2024, it will fall on a Friday. At the same time, during leap years, January, April and July start on the same day. This year it is a Monday.
The “leaping” of days and years while not scientifically understood by a lot of people was curious enough to generate unusual responses. Over the years, a variety of customs began to be associated with this day. Interestingly, several of these are associated with romance and marriage.
According to lore, in fifth century Ireland, St. Brigit lamented to St. Patrick about the fact that men always did the proposing while women were not permitted to propose marriage to men. Thus St. Patrick designated a day when tables could be turned, but ensured that this would not occur too frequently! This was to be 29 February, once every four years. Thus St. Patrick designated the only day that does not occur annually, February 29, as a day on which women would be allowed to propose to men, and called it Ladies Privilege day. While St. Brigid is usually associated with fertility, care for living things and peace-making, she may also be one of the earliest feminists! There was also a condition attached that if a lady’s proposal was refused, to compensate for her disappointment, the woman would have to be given a gift of silk gloves, a gown or a coat.
The tradition crossed the Irish Sea and reached England and Scotland, and onwards to parts of Europe. In some places, Leap Day became known as Bachelor’s Day. In Scotland the Ladies Privilege tradition was made a law by Queen Margaret in 1288, with the added caveat that women had to wear a red petticoat when proposing!
In Denmark the man who refused a proposal had to give the proposer twelve pairs of gloves, perhaps to help her hide her embarrassment that she was not wearing an engagement ring. In Finland, the rebuffed lady was to be given a gift of fabric to make a skirt.
Quite the reverse in Greece where it is traditionally believed to be unlucky to get married during a leap year, especially on leap day, because it was feared that it would end in divorce.
In Reggio Emilia, a province in northern Italy, a leap year is commonly known as l’ann d’ la baleina or the ‘whale’s year’. Italians in this region believe that whales give birth only during leap years. In Scotland leap year is considered unfavourable for farmers, as per the old rhyme “Leap year was never a good sheep year.”
And in France, the tradition on this day, is to read a satirical newspaper called La Bougie du Sapeur (Sapper’s Candle). Named after a French comic book character supposed to have been born on a leap day, the newspaper was first published on Leap Day in 1980, and is only published on this day every Leap Year. This is the world’s least frequently published newspaper ever, but the highest selling French paper in a single day. In 2020 it sold 200,000 copies! Perhaps it may break its own record this year.
And last but not the least, the day marks a 4-in-1 celebration for all Leaplings–people born on 29 February. There is an Honor Society of Leap Year Day Babies, an exclusive club indeed. And Leaplings have the added privilege of choosing whether to celebrate their birthday on 28 February or 1 March for the interim three years!
Happy Leap Day to all!
–Mamata
Millennial Matriarchs 