Ramadan will be celebrated twice in 2030 due to the 33-year lunar cycle

Look up the date of any Islamic holiday going back to 622 CE

The US Naval Observatory's calculator converts Hijri calendar dates to Gregorian and vice versa, covering Islamic holidays from the first year of the Islamic calendar through the present. The resource helps show how much Ramadan's dates shift year over year and allows readers to find out when Ramadan would have fallen in a certain year.

How to sight the new crescent moon that starts Ramadan

Ramadan doesn't begin on a fixed date. Instead, it begins when a crescent moon is visually confirmed. The Royal Museums Greenwich explains the astronomy behind the sighting, including the conditions that must be met: the sun must be below the horizon, the moon must be above it, and the two must not be within the Danjon Limit (roughly 5 to 7 degrees of separation in the sky, as shown below).

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.

Muslims fasting in Iceland face more than 20 hours of daylight during summer Ramadan

In countries near the Arctic Circle, Ramadan's rule of fasting from sunrise to sunset can cause some unique challenges for the extended periods of daylight in the region. Icelandic Muslims have developed pragmatic workarounds—some follow the hours of Mecca, others adjust locally. It's an edge case that illuminates how a 7th-century practice gets negotiated across radically different geographies.

Ramadan is a major television event in the Middle East

Each year, major networks air special 30-episode dramas timed to the month—one episode per night after iftar. Syrian productions long dominated the format, though that has shifted. The season is the advertising event of the year across the Middle East, rivaling the Super Bowl in commercial intensity.

UK's Royal Astronomers join the hunt for Ramadan's crescent moon

In Britain, Muslim communities and professional astronomers now collaborate to officially spot the moon that begins Ramadan, blending ancient practice with modern science. The partnership culminates in a live, unscripted annual broadcast even.

A 101 on why Ramadan is the holiest time of the Muslim year

As a spiritual guide for members of the Brandeis University community, this overview surfaces the highlights to orient readers on Ramadan logistics, practices, and obligations. It's a useful start for those interested in learning the basics around fasting rules, exemptions, the significance of iftar and suhoor, and common greetings.

Laylat al-Qadr: the single Islamic night 'holier than a thousand months'

Toward the end of Ramadan, Laylat al-Qadr is observed, recalling Muhammad's "night of power" when the Quran was first revealed, according to Islamic tradition. The Quran describes it as better than a thousand months of worship. Its exact date differs between Sunni and Shia adherents, falling on the 27th night of the month for Sunnis and the 23rd for Shias.

How lunisolar calendars work

Despite being called Lunar New Year, the Chinese calendar that the holiday is based on is actually lunisolar, or based on both the sun and the moon. Many religious holidays—including Easter, Ramadan, Chinese New Year, and Passover—do not have fixed dates according to the now-ubiquitous Gregorian calendar.

Visa data shows Muslim spending spikes at night during Ramadan

Fasting during the day reschedules economic activity to the night. Visa's spending data shows a surge in Muslim-majority markets during Ramadan at night as restaurants and retailers orient themselves around iftar. The pattern has become a significant target for advertisers and brands.

Nearly 70% of Muslim Americans always donate to charity during Ramadan

Zakat, one of the core pillars of Islam, directs Muslims to redistribute their wealth and give to the poor. This pillar is commonly honored during Ramadan and likely motivated by the practice of fasting, which encourages gratitude and compassion for those who are less fortunate. Other spikes in charitable giving are seen during the holiday of Eid al-Adha and at the end of the financial year.

Ramadan tends to reduce Gulf productivity, but increases reported happiness

Economists have documented a measurable dip in productivity and output in Muslim-majority countries during Ramadan. But surveys consistently show the opposite on subjective well-being, with people reporting they feel better and more connected.

Tarawih: the special night prayers during Ramadan

Beyond fasting, Ramadan nights have their own distinct ritual: Tarawih, an extended voluntary prayer performed after Isha, the standard final of five daily prayer times. Communities read through the entire Quran over the course of the month alongside these Tarawih prayers.

Eid ul-Fitr vs. Eid ul-Adha: differentiating the two lesser and greater Eids

Most non-Muslims associated Eid with the end of Ramadan—but that's actually the lesser Eid. The greater one, Eid ul-Adha, comes 70 days later and commemorates Ibrahim's (Abraham) willingness to sacrifice his son. It involves Qurbani, the ritual slaughter of an animal, with meat distributed to those in need.

The Year 2038 problem is the next potential computer time rollover bug

Many older systems store time as a signed 32-bit integer counting seconds since Jan. 1, 1970. That counter maxes out on Jan. 19, 2038—overflowing into negative time and sending clocks back to 1901, potentially crashing any older software that depends on accurate dates.

Every eclipse is preceded or followed by another eclipse, separated by about two weeks and alternating between solar and lunar types.

A diary of fasting through all 30 days of Ramadan

Aramco World's first-person account follows one Muslim through a full month of fasting—the pre-dawn suhoor meal, the hunger wall, the social texture of iftar. Get a sense of the day-to-day of Ramadan with this experiential guide.

Lunar New Year is celebrated around the globe

“Lunar New Year” is a catchall term that encompasses celebrations in several Asian countries. The date of the new year can vary by location depending on which calendar—lunar, lunisolar, or solar—is being used, but many of the traditions are shared across borders.

China has used several different calendars because of changes in government structure

For many centuries, during which China was an imperial nation, the lunar/lunisolar calendar (aka the “rural calendar”) was the basis for organizing the year. Several attempts were made over the decades to switch to the Gregorian calendar—which begins Jan. 1—but it wasn’t until the People’s Republic of China was founded in 1949 that it stuck.

Although the moon passes between the sun and Earth each month, its orbit is tilted by five degrees, preventing Earth from experiencing a solar eclipse each month.

The Five Pillars of Islam, explained through Islamic art at the Met

Fasting during Ramadan—known as sawm—is one of five foundational practices that define Muslim life. The Met uses art objects to illuminate the pillars to make the theology more tangible. Ramadan's fast is interwoven with this broader framework of prayer, charity, pilgrimage, and expressions of faith.

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.

A readable narrative account of how Muhammad first received the Quran

The story behind Ramadan's origins involves a lesser-known layer of personal drama for Muhammad, who fled the Cave of Hira in fear thinking he had been possessed by the angel communicating with him. Only his wife, Khadijah, was able to reassure him. The first revelation came during Ramadan in 610 CE, but the full Quran took 23 years for the angel Jibril (or Gabriel) to deliver.

The number of billionaires in Saudi Arabia is projected to increase by 183% by 2031

Countries in the Middle East and Asia are projected to have some of the largest economic expansions by 2031, including within their billionaire populations. The global average growth projection for billionaires is 26% between 2026 and 2031.

The moon is moving 3.8 centimeters farther away from Earth each year

Driven by tidal forces, the effect is minimal and slow, ensuring stable tidal patterns and lunar cycles. Earth's rotation slows down as the Moon gains orbital momentum, slowly lengthening the day over time.

Iftar foods from around the world

The global population of Muslims eats and fasts in distinct way around the world. This photo survey spans Morocco's harira soup to Indonesia's kolak (a sweet dessert soup) and Turkey's pide (like pizza but without the tomato sauce). The one universal aspect for most iftar meals is dates and water, following Muhammad's practice. (Some users may experience a paywall.)

In 2024, China announced plans to establish an international lunar research station

The strategy, which runs until 2050, focuses on advancing space science, fostering technological innovation, and exploring habitable planets and extraterrestrial life, beginning with landing astronauts on the moon before 2030.

The Lunar New Year is a major driver in China's economy

The annual festival brings in billions of dollars in both foreign and domestic tourism. The 2026 holiday includes an additional day, something Chinese officials hope will provide an even bigger boost to the country's somewhat stubborn national retail sales.

In 1995, Hakeem Olajuwon won NBA Player of the Month while fasting

When Ramadan began on February 1, 1994, Olajuwon fasted every day of the month while playing for the Houston Rockets. He still won Player of the Month. His story is a fascinating look on how world-class athletes stay competitive while observing their religious obligations.

Changes in Earth's orbital cycles influence the timing of ice ages

These cycles include changes in Earth's orbit shape, tilt, and wobble, all of which alter how much solar energy different parts of Earth receive over time. Due to orbital eccentricity, summers in the Northern Hemisphere last about 4.5 days longer than winters.

The ancient Roman origins of the leap year

The earth's orbit around the sun takes about 365.2422 days, leaving farmer almanacs the awful job of pretending the calendar year fits into a whole number. This article explores the modern origins of the civil solar calendar and its leap year. The Julian calendar, named after the Roman emperor Julius Caesar, cut the calendar year into 365.25 days, gifting the public an extra day every four years. Learn more of the history here.

Why Easter's date changes, making it a 'moveable feast'

Unlike Christmas, Easter has no fixed date: It falls on the first Sunday after the first full moon on or after March 21, a formula set by the Council of Nicaea in 325 CE to form a standard across Christianity. The result is a window of 35 possible dates, from March 22 to April 25.

By 2030, roughly 6% of the world's population will be in menopause

An estimated 25 million women pass through menopause annually, with a projected increase in the number of women in menopause in both lower-resource and higher-income populations in the years ahead, highlighting the social and economic value of focusing on menopause care.

By identifying patterns in the periodic movements of the sun, moon, and Earth, ancient civilizations realized that identical eclipses repeat about once every 6,585 days, known as the saros cycle.

For the medievals, the moon was a versatile religious symbol

Within the distinct traditions of Christianity and Islam, the moon became a central metaphor and sign for religious teaching. For Christians, its light was used to explain Jesus' humanity with the light of the sun (divinity). For Muslims, the moon represented a cosmic longing for god.

There may be 500,000 additional malaria deaths by 2050 according to peer-reviewed research published in 2026.

Why time ticks faster on the moon, which may need its own time zone

Because Earth exerts a stronger gravitational pull than the moon, it lags behind between 56 and 59 microseconds each day, or about one second every 46.5 years. This impacts essential synchronous operations of future electronic equipment on the lunar surface, which could be alleviated by a standardized conversion system between Earth and moon time zones.

Rising sea levels due to climate change may be slowing Earth's rotation

A 2024 PNAS study found that from 2000 to 2020, the length of a day increased at a rate of 1.33 milliseconds per century, an unprecedented amount in the 3.6 million years of day-length changes reconstructed from an analysis of benthic foraminifera fossils. Researchers suggest the slowing comes from changing ice sheets redistributing planetary mass.

See a lunar eclipse share the night sky with the Milky Way

Photos taken at the Cerro Tololo Inter-American Observatory in Chile in March 2025 captured a blood moon and the Milky Way galaxy within the same field of view. The moon appears red from the bluer parts of its reflected sunlight being scattered by Earth's atmosphere.

The last day of the Lunar New Year culminates in the Festival of Lanterns

The Festival of Lanterns celebrates the first full moon of the year. Elaborate, colorful light displays are held throughout China, with many regions having their own unique traditions, from the candle-lit lanterns in the south to the elaborate lighted ice sculptures common in the northeast.

A year's name is determined by the 12-year Chinese zodiac cycle

According to Lunar New Year traditions, the coming year gets its name based on the 12-year Chinese zodiac cycle. The animals, in order, are rat, ox, tiger, rabbit, dragon, snake, horse, goat, monkey, rooster, dog, and pig. 2026 is the Year of the Horse, an animal known for its strength and momentum, while 2027 will be the Year of the Goat.

Ending daylight saving time may prevent as many as 300,000 strokes annually

Changing clocks twice a year disrupts circadian rhythms, which last an average of 24 hours and 12 minutes. Studies have shown that permanent daylight saving time provides fewer health benefits than standard time.

World health experts expect more than 240 million global cases of AMD in 2030

The World Health Organization estimated in 2019 that by 2020 there would be roughly 195.6 million cases of age-related macular degeneration and projected that the number would continue to grow. (Some users may experience a paywall.)

Social Security funding is mandated by law, not budgeted each year by Congress

Unless Congress acts before the Social Security trust fund becomes depleted in 2034, its current revenues would cover 81% of Social Security benefits. However, that share would decline to 72% by 2099.

Over thousands of years, the frequency of solar eclipses is greatest around the Arctic and Antarctic Circles and lowest near the equator.

Explained: The Year of the Rabbit

One of the world's largest holidays, this visual guide will help you welcome the Year of the Rabbit and celebrate the new lunar year.

New Year's Eve celebrations date back to ancient Babylon

Rather than celebrating in winter, the Babylonians honored the vernal equinox, a day in late March with equal amounts of darkness and light that signaled the start of a new year. They celebrated with Akitu, an 11-day festival.

The Lunar New Year lasts 15 days, with specific rituals for specific days

On the first night, loved ones gather to celebrate their honor and say goodbye to the successes and tribulations of the old year. On the fourth day, the God of the Kitchen is honored to prevent kitchen accidents. And beginning on day 12, people prepare for the final Festival of Lanterns.

The world's different calendars, explained

The calendar we use to mark the days, months, and year can feel set in stone, but the history of calendars shows these organization systems can and do change. Parse the fascinating, complex details of the Gregorian, Julian, Chinese, Hebrew, and many more calendars in this comprehensive, well-executed explainer video.

The Hajj