Calendar mysteries

Were you born on this rare date? Only 1 in 1,461 people were

Most of us think we know the calendar pretty well, and if we don’t, our phones are there to remind us of dates and events. But the way humans measure the passage of time hasn’t always been the same. From the origins of month names to the truth behind leap years, today we’re going to share 10 surprising facts you probably didn’t know about the calendar.

The probability of being born on February 29 is 1 in 1,461. Although birthdays on this date are rare, people born on it even have a name: leaplings. Leaplings officially get to celebrate their birthday on February 29 only once every four years, but what happens in the other years? While some people prefer not to jump to another month, March 1st is considered more astronomically accurate, as it comes directly after February 28.

The Earth’s orbit is elliptical, which means there are times when we are closer to the Sun and other times when we are farther away. In January, Earth is at its closest point to the Sun, known as "perihelion." You might wonder how we can be closer to the Sun during winter, but the seasons are caused by Earth’s tilt, not by our distance from the Sun. On the other hand, the month when we are farthest from the Sun is July, and this point in the orbit is called "aphelion."

Due to its particularly short duration, February is the only month that can lack a full moon. Lunar cycles are 29.5 days long, which means that, approximately every 19 years, February has all the lunar phases except the full moon. When this happens, both January and March have two full moons, with the second one being called a "Blue Moon"; and that's why, when we say "once in a blue moon," we're talking about something that happens very rarely. The next time this will happen will be in the year 2037.

Did you know that our calendar has a name? That’s right; most of the world uses the Gregorian calendar, named after Pope Gregory XIII, who introduced it in 1582 as a reform of the older system.

The main difference lies in how leap years are handled. The previous system, known as the Julian calendar, added a leap year every four years, assuming a year lasted exactly 365.25 days. However, a real solar year is slightly shorter. To fix this, the Gregorian calendar keeps leap years every four years with one exception: century years (like 1900) are not leap years unless they are divisible by 400 (such as 2000).

But before the Julian calendar, ancient Rome used an even older system with one key difference: it had only 10 months. This calendar began in March and ended in December, totaling just 304 days. What about the remaining days? They were considered a winter gap and simply weren’t counted. Around 700 BC, January and February were added to fill that gap, and these changes were later standardized under Julius Caesar’s reform in 45 BC, when he introduced the Julian calendar.

The names also come directly from life in ancient Rome, where months were named in honor of deities and important festivities. For example, March was named Martius after Mars, the god of war, because it marked the start of the military campaigning season. Aprilis, the Roman name for April, comes from the Latin verb aperire, meaning "to open," in reference to the arrival of spring. May was named Maius after Maia, the goddess of fertility and growth, and June was named Iunius in honor of Juno, the Roman goddess of marriage.

What about the rest of the months? From July through December, they were originally named after their position in the year. Since March was considered the first month, July was called Quintilis ("the fifth"), August was Sextilis ("the sixth"), September comes from septem, meaning "seven" in Latin, October from octo ("eight"), November from novem ("nine"), and December from decem ("ten").

Most of these names remained similar, with two exceptions: Quintilis was renamed Iulius to honor Julius Caesar after his death, and Sextilis became Augustus, in honor of Augustus Caesar, the first Roman emperor.

The days of the week are no exception to Roman tradition. Sunday was named dies Solis ("day of the Sun"), Monday was dies Lunae ("day of the Moon"), Tuesday was called dies Martis (day of Mars), Wednesday dies Mercurii (day of Mercury), Thursday dies Iovis (day of Jupiter), Friday dies Veneris (day of Venus), and finally, Saturday was dies Saturni (day of Saturn).

As you may have noticed, only Saturday retained its Roman root, while Sunday and Monday kept their meaning but were translated. What happened to the rest? They were influenced by Norse mythology, resulting in Tuesday being named for Tyr, a Norse god of war; Wednesday after Woden (Odin), the Norse interpretation of Mercury; Thursday from Thor, the god of thunder, replacing Jupiter; and Friday from Freya, a Norse goddess linked to the Roman Venus.

In the United States, Sunday is considered the start of the week. This tradition has religious and cultural roots, and it’s shared by many parts of the world, but not all of them. In fact, several other English-speaking countries do it differently: places like England, Australia, and parts of Canada consider Monday the first day of the week, with Sunday closing it out.

Do you use any of these?

Why do we say ‘kick the bucket’? Discover 12 idioms with morbid origins

We use a lot of strange phrases without thinking twice, but some have surprisingly grim origins. Ever say someone "kicked the bucket" or "bit the dust"? These everyday expressions sound harmless, but have more somber roots. Take a look at 12 of these idioms. Do you use any of these?

In 13th-century Britain, bakers risked losing a hand if they sold underweight bread, according to the Assize of Bread and Ale under Henry III. To avoid punishment, they often added a little extra to each order.

When selling 12 loaves, bakers would include a 13th—called a "vantage" loaf. This became what is now known as "a baker’s dozen."

Saying you're "as pleased as punch" sounds cheerful, but it has dark roots. The phrase comes from Punch from the Punch and Judy puppet shows, who gleefully committed violent acts.

Popular in 17th-century England, these shows featured Punch killing his family and others with a slapstick, laughing after each act.

The phrase "meet a deadline" might sound stressful today, but its origins are far darker. During the Civil War, the "deadline" referred to a boundary at Andersonville Prison, where Union soldiers were held.

This line, 20 feet inside the outer wall, was meant to prevent escapes. Any prisoner who crossed it was shot by guards in pigeon roosts. The term came from this deadly boundary, where crossing meant certain death.

Today, a "blockbuster" refers to a huge commercial hit, but the term originally described powerful bombs from World War II.

The British Royal Air Force used blockbusters, massive cylinders filled with explosives, capable of destroying entire streets. It wasn’t until 1957, nearly a decade after the war, that the term shifted to describe big entertainment successes.

The phrase "to bulldoze" someone means to force or bully them, but its origins are much harsher. First used in 1876, "bull dose" referred to brutally whipping or beating someone, similar to how a bull might be punished.

By 1880, "bulldoze" became a verb, and eventually, the heavy machinery designed to push through obstacles was named a bulldozer.

The word "sinister" comes from the Latin sinister, meaning "left" or "on the left side." By the 15th century, left-handedness was associated with evil, often linked to witches and the devil.

Because of this stigma, left-handed people were forced to use their right hands. Today, however, we know that being left-handed doesn’t make anyone sinister, and many renowned thinkers, like Leonardo da Vinci and Benjamin Franklin, were left-handed.

The Mad Hatter from Alice’s Adventures in Wonderland is famous for his colorful personality, but his madness has historical roots. In the 18th and 19th centuries, hat-makers, known as "hatters," often suffered from mercury poisoning due to their work with the chemical.

This poisoning led to mental deterioration, giving rise to the idea of the "mad" hatter, a term that Carroll cleverly incorporated into his character.

Today, "pulling your leg" means joking or fooling around, but it once had a much darker meaning: in 19th-century London, thieves would pull people’s legs to drag them down before stealing their belongings.

This tactic was commonly used by robbers, turning what is now a lighthearted phrase into a serious crime.

In the world of films, we often see characters drinking whiskey before a quick surgery or amputation. But in real battlefields, soldiers didn’t have that option.

One theory about the origin of the expression "to bite the bullet" suggests that, during painful medical procedures, wounded soldiers would literally bite down on a bullet—taken from the ground or from their own weapon—to help endure the agony without crying out.

The phrase "God bless you" after a sneeze has several theories behind it. One theory links it to preventing the plague, while another suggests it’s a way of ensuring the soul stays in the body during a sneeze.

The phrase "kick the bucket" means to die and has been used since the 18th century. One theory connects it to the Catholic tradition of placing a bucket of holy water by the feet of the deceased for mourners to sprinkle.

Another theory suggests the term comes from 16th-century England, where "bucket" referred to a beam. When animals were hanged for slaughter, they would kick the beam as they died, giving rise to the idiom.

The phrase "bite the dust" likely originated in the 19th-century Old West, referring to gunfights and battles. It paints a vivid picture of someone falling to the ground and biting the dust after being struck by a fatal wound.

Over time, the expression broadened, and now it simply signifies someone’s death or defeat, no longer tied specifically to gunfights.