Some Christian communities start Advent six weeks before Christmas instead of four

Advent marks the beginning of the church calendar in Western Christianity

Each denomination’s calendar of holy days varies, but most mark the start of a new year at the beginning of Advent. Within Roman Catholicism, Advent is a distinct period from Christmas, alongside other seasons: Ordinary Time, Lent, Easter, Holy Week, and Pentecost.

Advent's length varies from 21 to 28 days each year

Because Advent always begins on the fourth Sunday before Christmas, its duration varies. When Christmas falls on a Monday, Advent is unusually short, and when it falls on a Sunday, it can be nearly four full weeks long.

Early European observance varied between penitential and celebratory seasons

For centuries, churches disagreed over the purpose of Advent: Gaul and Spain treated it as a long, penitential fast beginning on November 11, while Rome observed a shorter, more joyful season. These competing traditions were only blended into a unified Advent in the Middle Ages.

The earliest Advent was a Lent-like fast beginning Nov. 11

In 490, Bishop Perpetuus of Tours ordered Christians to fast three days a week from St. Martin’s Day (Nov. 11) until Christmas. This 40-day season—called St. Martin’s Lent—is one of the earliest documented forms of Advent.

One of the earliest Advent practices came as a response to a heretical movement

In 380 CE, the Council of Saragossa met to oppose the spread of Priscillianism, a local heresy. The council ordered Christians to observe strict church attendance from Dec. 17 to Christmas—one of the earliest documented Advent-like practices.

See how Advent traditions vary widely around the world

Advent is celebrated in distinct ways across countries—Chinese Christians hang colorful lanterns, Mexicans reenact Las Posadas processions, Germans light weekly wreath candles, and Hungarians attend dawn matins—reflecting how local cultures shape the season’s preparation.

Many Christians observe a different theme for each week of Advent

Many churches structure Advent around weekly themes—often hope, peace, joy, and love—which shape sermons, prayers, Scripture readings, and the lighting of candles on the Advent wreath. The specific themes vary widely across denominations and communities.

Advent originally had almost nothing to do with the Christmas story

Early Advent wasn’t about celebrating Jesus’s birth. In the 5th and 6th centuries, the season focused almost entirely on preparing for Christ’s Second Coming and “final judgment.” Advent’s connection to the Nativity only emerged centuries later.

The traditional colors of Advent are purple, rose, and white

Purple is Advent’s primary color, symbolizing preparation and prayer; rose appears on the third Sunday to signal joy; and white, used for the fifth Advent candle or Christmas liturgies, represents purity and celebration as Christmas arrives.

How Eastern Orthodox and other Christians celebrate Easter differently

Western churches switched to the Gregorian calendar in 1582, though the Orthodox Church still calculates Easter using the Julian calendar, which runs 13 days behind. Orthodox Easter also must always follow Jewish Passover. The result is two Easters that can fall up to five weeks apart.

The first chocolate Advent calendar appeared in 1958

Chocolate Advent calendars began in 1958, when German companies first paired the traditional countdown with small pieces of chocolate behind each door. The idea spread slowly at first, but eventually became one of the most popular Advent calendar formats worldwide.

Seven ancient ‘O Antiphons’—names for Jesus—are sung in the days before Christmas

The antiphons are prayers that express a profound longing for Jesus’ return and commemorate His birth. Each of the antiphons (for example, "O Emmanuel," the basis of the classic hymn) ascribes a different name to Jesus, like O Sapientia (“wisdom”) and O Rex Gentium (“king of the nations”).

Martin Luther is often cited as the first to decorate the Christmas tree—though the practice began decades earlier

Luther lore claims he may have been the first to link tree decorations to Jesus, as he used candles to symbolize the Nativity star. However, German bakers had adorned evergreens with apples and sweets as early as 1419 for Christmas Eve displays.

Santa Claus is the result of centuries of evolving traditions

Originating from Saint Nicholas, a 4th-century bishop celebrated for his generosity, Santa's story merged with European folk legends like Sinterklaas and Father Christmas. By the 1800s, American culture redefined him, thanks to Clement Clarke Moore’s poem "'Twas the Night Before Christmas" and Thomas Nast’s illustrations.

Why Christians eat fish on Fridays during Lent

The rule isn't actually to eat fish—it's to abstain from eating warm-blooded animals on Fridays, the day of the crucifixion. Fish filled the gap because it was cheap, plentiful, and theologically convenient. As it happens, the medieval Catholic calendar's proliferation of meatless days became one of the drivers of the global fishing industry.

Mardi Gras blends pagan celebrations with Christian traditions

The holiday has its roots in pagan celebrations, like ancient Rome's Saturnalian and Lupercalian festivals, which celebrated spring and fertility. Rather than abandoning these traditions, Catholic leaders in Rome incorporated their spirit into a celebration that would expel citizens' debauchery in preparation for the sacrifices they'd endure during the Lenten season. Around the world, this holiday season is called Carnival, though the New Orleans version is usually called Mardi Gras.

The Stations of the Cross reenact Jesus' 'passion,' or suffering

The practice originated with early Christian pilgrims walking the Via Dolorosa—the path Jesus likely look as he walked with his cross to the site of his crucifixion—in Jerusalem and took root in European churches in the fifth century CE as a devotion for those who couldn't travel to the Holy Land. Pope Clement XII fixed the number of stations at 14 in 1731; five of them are based entirely on tradition, rather than scripture.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

Asia's agriculture-focused set of 24 'small seasons'

In contrast to the four broad seasons and their basis in astronomy and climate, ancient farmers in China and Japan had many more and varied seasons (or "sekki). Take Keichitsu (March 6 to 21), for example: this means "going-out of the worms" when bugs come out from hibernation.

El Niño, Spanish for 'the boy,' was named after Jesus Christ because the phenomenon resembled the weather changes observed around Christmastime.

Ramadan moon-sighting can spark intra-family disputes

Because different communities—and even different members of the same family—follow different methods for confirming the crescent, Ramadan doesn't always start on the same day for everyone. The result: "moon wars" that pit parents against children, and mosques against each other, on when exactly the fast begins.

The lost medieval habit of 'two sleeps'

While most people accept a single seven-to-nine-hour nightly slumber is ideal, the approach is a relatively modern idea. For centuries, interrupted sleep was the norm, with historians uncovering descriptions of two periods of sleep during the normal 24-hour cycle.

Fascinating photos of abandoned Italian churches

Whether cloaked in thick moss and debris or almost entirely preserved, the abandoned churches photographed by Roman Robroek document the effects of a changing landscape. At least 1,000 of the religious spaces are left unoccupied in both small towns and cities throughout Italy and stand in varying stages of decay.

Why meteorologists say summer starts June 1

There are at least two periods called summer: astronomical and meteorological. Astronomical summer mirrors the movement of celestial bodies and begins roughly around June 20, with the summer solstice. Meteorologists designate the beginning of June as the start of summer to make tracking weather patterns from year to year easier.

The best day to buy a Christmas tree, with data

Using data from 200,000 tree sales in 2018, the authors found that some weekends are more expensive than others. Learn when it's optimal to buy a tree here.

The federal budget process begins nearly a year before funds are spent

Creating the federal budget starts months in advance. This resource explains each stage, showing how the president proposes priorities, Congress reshapes and approves funding, and federal agencies implement the final budget.

The modest monks behind Trappist beer

Trappist monks, a sect of Catholic clergy, follow a strict code that requires all work to benefit their religious community. It's believed they began brewing beer sometime in the 6th century to fund their abbeys.

'Silent' fireworks have gained more interest in recent years as a quieter celebratory option.

Prince's sexually explicit 1984 track 'Darling Nikki' attracted the ire of the Parents Music Resource Center, an advocacy group that inspired the Parental Advisory sticker, even though the song ends with a Christian message.

44% of Americans say they pray at least once a day—discover how your state's religiosity stacks up against the rest of the country.

See photos of Meteora, a mountainous site in central Greece, home to 14th-century monasteries perched atop soaring outcroppings.

The term 'algorithm' originated from the Latinized name of al-Khwārizmī, a 9th-century mathematician whose works introduced Arabic numerals and the decimal-based numeral system to Europe and whose treatise 'Al-Jabr' gave algebra its name.

The 2026 Ebola outbreak is hampered by a lack of vaccine against the species of the virus, heightening the need for rapid tests to aid in disease control.

Salvador Dalí believed he was his own dead brother, who had died nine months before he was born

NBA superstar Victor Wembanyama spent the 2025 summer training with monks in central China to enhance his body and mind.

Waves off the coast of Nazaré, Portugal, can reach over 100 feet and are caused by the area's deep underwater canyon geography

Scientists can determine Earth's past climate conditions by analyzing air trapped in microscopic bubbles within ice cores—columns of compressed snow layers that build up over hundreds of thousands of years.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Explore chaos in this simulation of two double pendulums, where small differences in the release angles produce wildly different outcomes.

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

The Brothers Grimm were lawyers before they were storytellers, but became interested in fairy tales as they began investigating how rules and customs had been passed down through cultures.

Up to a million Girl Scouts sell about 200 million cookie boxes every spring, generating $800 million, largely because refusing a child is frowned upon

Poison ivy can cause rashes year-round since all parts of the plant contain urushiol, the oil that triggers our allergic response.

In recent years a child anxiety expert has created and tested a novel phobia and anxiety treatment approach for children, focused on changing how parents respond to the fears.

Coral reefs get their colors from zooxanthellae—microorganisms that line corals' digestive tracts and provide them with sugars in exchange for a home within this protective tissue.

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

See how Budweiser's famous Clydesdales spend their days at Warm Springs Ranch, where roughly 70 to 80 of the beer brand's giant horses can be found at any given time.

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

While the first exchange-traded fund (a 'basket' of different assets that can be bought and sold on a stock exchange) in the US only launched in 1993, the global ETF market has grown to more than $10T in the short time since.