Eid al-Fitr and Eid al-Adha 2027: Moon Sighting Dates, Forecasts and the Science Behind Them

Planning ahead for the two greatest celebrations in the Islamic year requires a clear grasp of how the lunar calendar actually works. This article brings together astronomical forecasts, sighting criteria, and the reasons different communities may celebrate on different days, so that whether you follow a local crescent sighting or a pre-calculated calendar, you can prepare with confidence.

Eid al-Fitr and Eid al-Adha 2027 at a Glance

Eid al-Fitr 2027 (1 Shawwal 1448) is most likely Wednesday 10 March 2027 for calculation-based and global-calendar communities, with Thursday 11 March 2027 remaining possible for regions that require a confirmed local naked-eye sighting. Eid al-Adha 2027 (10 Dhul-Hijjah 1448) is expected on Sunday 16 May 2027.

These dates are astronomical forecasts based on conjunction timing and established crescent visibility criteria. They are not official religious rulings. Any date in the table could shift by one day depending on the authority followed in your country.

When Is Eid al-Fitr 2027?

Eid al-Fitr marks the end of Ramadan and the first day of Shawwal. To understand why the date forecast is Wednesday 10 March 2027, it helps to trace the whole month from its beginning, which we forecast in detail in when does Ramadan 2027 start.

The Start of Ramadan 1448

The astronomical conjunction that begins the Shaban to Ramadan transition occurs on the evening of Sunday 7 February 2027. Because the Moon sets before or very shortly after the Sun across virtually all longitudes on that evening, the crescent is geometrically impossible to sight. The world therefore enters Ramadan on Monday 8 February 2027, whether by calculation or by attempting and failing to sight the crescent on the 7th.

The Shawwal Conjunction and Crescent Window

The conjunction marking the end of Ramadan 1448 occurs on Sunday 8 March 2027 at approximately 09:30 Universal Time. That places the conjunction well before sunset at Mecca, but the Moon is still far too close to the Sun for any crescent to be visible anywhere on Earth that evening. The crescent age at sunset on 8 March will be between roughly 7 and 10 hours depending on longitude, which falls below any recognised visibility threshold.

On the evening of Sunday 9 March 2027 the picture changes dramatically. By the time the Sun sets across Asia, Africa, Europe and the Americas, the crescent will have grown to a width visible to the unaided eye under good atmospheric conditions across a large swathe of inhabited land. Visibility maps generated using the Yallop q-value criterion show the 9 March crescent reaching the easily visible band (category A or B) across most of Asia and Africa, and the marginally visible band across Western Europe and the eastern Americas.

This gives rise to two realistic scenarios:

1. Communities that began Ramadan on 8 February and accept the crescent sighted on the evening of 9 March will celebrate Eid on Wednesday 10 March 2027. This is the most probable outcome for the majority of the global Muslim population.

2. Communities that require a confirmed local naked-eye sighting in their own country, or that began Ramadan a day later, may observe Eid on Thursday 11 March 2027. This applies primarily to some communities in the United Kingdom, North America and parts of West Africa where heavy atmospheric haze in early spring frequently prevents naked-eye sighting even when the crescent is theoretically above the horizon.

A point that bears emphasis: moon age at sunset is not the relevant criterion for visibility. A crescent can be 40 hours old and still invisible if the elongation is too small, the sky too bright, or the atmosphere too turbid. What determines visibility is the arc of vision (ARCV), the arc of light (ARCL), and the crescent width at the moment of observation. For a full explanation of these quantities and how they feed into visibility predictions, see our article on the science behind the crescent.

When Is Eid al-Adha 2027 and the Day of Arafah?

Eid al-Adha, the Festival of Sacrifice, falls on 10 Dhul-Hijjah every year. Its date is governed by the sighting of the Dhul-Hijjah crescent, which also sets the calendar for the Hajj pilgrimage.

1 Dhul-Hijjah 1448

The conjunction for Dhul-Hijjah 1448 is expected in the first days of May 2027. Based on conjunction timing and standard crescent visibility modelling, 1 Dhul-Hijjah 1448 is forecast as Friday 7 May 2027. This means the count to Eid al-Adha runs as follows:

• 1 Dhul-Hijjah: Friday 7 May 2027
• 8 Dhul-Hijjah (Tarwiyah, day of departure to Mina): Friday 14 May 2027
• 9 Dhul-Hijjah (Day of Arafah): Saturday 15 May 2027
• 10 Dhul-Hijjah (Eid al-Adha): Sunday 16 May 2027

The Unique Role of Saudi Arabia for Eid al-Adha

Eid al-Adha carries a dimension that distinguishes it from Eid al-Fitr in a practically important way. The Hajj rites, including the standing at Arafah (wuquf), are performed at a single, fixed physical location outside Mecca. Muslim scholars widely hold that because the Day of Arafah is physically tethered to a place, its date is determined by the crescent sighted in Saudi Arabia, not by local sightings in each country.

In practice this means that a much larger share of Muslim communities worldwide synchronise with Saudi Arabia for Eid al-Adha than they do for Eid al-Fitr. For the majority of Muslims, Eid al-Adha 2027 will be Sunday 16 May 2027, provided Saudi authorities sight the Dhul-Hijjah crescent on Thursday 6 May 2027 evening or that calculation confirms 1 Dhul-Hijjah as 7 May.

The Day of Arafah (Saturday 15 May 2027) matters not only for pilgrims but also for the millions of non-pilgrims who fast that day. A miscalculation of even one day means fasting on the wrong day, which gives crescent-date accuracy a weight that goes well beyond administrative convenience.

Why the Dates May Differ in Your Country

If you have ever found yourself celebrating Eid on a different day from friends in another country, you are experiencing a centuries-old scholarly debate rather than a mistake by either party. There are three main reasons for national or community-level variation.

1. Differing Sighting Rules: Local vs Global

The central juristic question is whether each Muslim community must sight the crescent within its own borders (ikhtilaf al-matali, the principle of differing horizons) or whether a sighting anywhere on Earth suffices for the whole ummah (ittihad al-matali, the principle of unified horizons). Classical Hanafi, Shafi'i and Hanbali schools have historically favoured the local-sighting position, though many contemporary scholars and institutions have moved towards global sighting or calculation.

The cascade effect is significant: the further west a country sits, the later sunset occurs relative to the conjunction, and therefore the less likely a local sighting becomes on the first eligible evening. Countries in Western Europe and the Americas are routinely at a disadvantage compared with countries in the Arabian Peninsula or South Asia.

2. Naked-Eye vs Calculation

Some communities will not accept a date unless a physical crescent is seen by reliable witnesses. Others accept pre-calculated calendars validated by bodies such as the European Council for Fatwa and Research or the Fiqh Council of North America. Still others combine both, requiring calculation to confirm that sighting is astronomically possible before accepting witness testimony.

3. Different Reference Authorities

Each country typically defers to a national moon-sighting committee, a supreme court, or a religious ministry. Saudi Arabia's Supreme Court announcement carries the most global weight, particularly for Dhul-Hijjah. Turkey follows its Diyanet calculation. Morocco uses its own committee. South Africa, the United Kingdom and the United States have multiple competing authorities within a single country.

For a deeper look at why these differences exist and how scholars have approached the debate, see our article on why Muslims start Ramadan on different days.

How These 2027 Forecasts Are Calculated

The forecasts in this article are not guesses. They rest on decades of mathematical work formalised by two landmark studies.

Conjunction vs Hilal

The first step is calculating the conjunction, the instant when the Moon's ecliptic longitude equals the Sun's. That moment is precise to within seconds using modern ephemerides (NASA's JPL DE series, for instance). The conjunction, however, is invisible. The challenge is predicting when the crescent first becomes detectable.

Yallop's q-Value (1997)

Bernard Yallop of HM Nautical Almanac Office published a criterion in 1997 that assigns each evening a single number, the q-value, derived from the crescent width (W) and the arc of vision (ARCV) computed for best-viewing latitude. The q-value sorts each sighting opportunity into one of six bands:

For the evening of 9 March 2027, the Shawwal crescent sits in band A or B across most of Asia and Africa, confirming that a widespread naked-eye sighting is expected and that Eid on 10 March is well supported.

Odeh's V-Value (2004)

Mohammad Odeh refined Yallop's work using 737 recorded crescent observations. His V-value criterion produces four outcome zones on a visibility map: easily visible, visible under good conditions, visible only with optical aid, and not visible. The colour bands that appear on Hilal Vision's interactive maps correspond directly to Odeh's zones, which allows you to see at a glance whether your city falls inside or outside the sighting window for any given evening.

To understand what sets the absolute physical lower bound on crescent visibility, see our article on the Danjon limit, which explains why no crescent can be seen below an elongation of roughly 7 degrees regardless of telescope aperture.

Frequently Asked Questions

Is Eid al-Fitr 2027 on Wednesday or Thursday?

The most probable date is Wednesday 10 March 2027. The crescent of Shawwal 1448 is forecast to be visible across large parts of the world on the evening of Sunday 9 March, making the next day (Monday counts through to Wednesday, following 29 days of Ramadan from 8 February) the first of Shawwal. Thursday 11 March 2027 remains possible for communities in Western countries that require confirmed local sighting, since atmospheric conditions in early March can prevent a naked-eye observation even when the crescent is geometrically above the horizon.

When is Eid al-Adha 2027?

Eid al-Adha 2027 is expected on Sunday 16 May 2027 (10 Dhul-Hijjah 1448). The Day of Arafah, the most important day of the Hajj pilgrimage and a recommended voluntary fast for those not performing Hajj, falls on Saturday 15 May 2027.

Why is the date not 100 per cent confirmed?

The Islamic lunar month begins only when the relevant crescent is actually sighted, or when a calculation-based authority confirms that sighting is astronomically valid. No astronomical forecast can account for local weather on the evening of observation, nor can it substitute for the authoritative announcement of whichever body your community follows. The dates given here are the most probable outcomes based on current conjunction data and the Yallop and Odeh criteria; they are not official religious rulings.

Will my country celebrate on the same day as Saudi Arabia?

For Eid al-Adha, the answer is usually yes. The majority of Muslim communities worldwide follow Saudi Arabia's crescent announcement for Dhul-Hijjah because the Hajj rites are physically tied to a place and date in Saudi Arabia, making a unified date the prevalent approach.

For Eid al-Fitr, the answer depends on local authority. Countries or communities that use their own moon-sighting committees, particularly those that insist on a local naked-eye sighting, may celebrate one day later than Saudi Arabia or one day later than calculation-based communities. In years where the crescent is only marginally visible, the gap between the earliest and latest celebrants can reach two days.

Can I use Hilal Vision to check the crescent for my city?

Yes. Hilal Vision's interactive visibility maps and city-level crescent data allow you to enter your location and see the Yallop and Odeh band predictions for any evening. Check the forecast for the evenings of 9 March 2027 (Shawwal) and 6 May 2027 (Dhul-Hijjah) as those dates approach for the most accurate local picture.

References

• Yallop, B. D. (1997). A Method for Predicting the First Sighting of the New Crescent Moon. NAO Technical Note No. 69, HM Nautical Almanac Office.
• Odeh, M. Sh. (2004). New Criterion for Lunar Crescent Visibility. Experimental Astronomy, 18, 39 to 64.
• Danjon, A. (1936). Le croissant lunaire. L'Astronomie, 50.
• Moonsighting.com. Shawwal 1448 crescent data. https://moonsighting.com/1448shw.html
• AlHabib Global Islamic Calendar 2027. https://www.al-habib.info/islamic-calendar/global/global-islamic-calendar-year-2027-ce.htm
• Wego. Ramadan 2027 Guide. https://blog.wego.com/ramadan-2027/
• Islamic Crescents Observation Project (ICOP). https://astronomycenter.net/icop/

Clear skies and happy sighting.