By Eng. Qamar Uddin, ICOUK (July 2022/Dhul Hijjah 1443) [download pdf]

Further to my previous email/article last year (April 2021) about Local and Regional Moon Sighting where I had proposed that up to then (2021/1442), we have undertaken the role of the public to do Moon Sightings and Reportings but to adopt an independent Local Moon Sighting System, we will also need to undertake Testimonies and make Declarations too (very rapidly and accurately).

Over the past year, we have conducted the above trials with the help of many UK Moon Sighting volunteers and Trial Testimony Ulama Panels. We have overcome some minor teething problems during the trial and I am pleased to report that the result of the complete Local Sighting trial is both practical and achievable, Alhamdulillah.

However, the number of people reporting to the ICOUK website this year (1443/2022) has gone down slightly from last year (1442/2021), especially during the winter months (when sunset is during the working hours) but the total number of months the moon was sighted remained the same (10 out of 12 months), which continues to fully meet the Hijri Calendar rules of the Shariah (eg. “If the sky is cloudy then complete 30-days [1] [Muslim:1081c]).

Comparison UK Morocco1443 tableLooking at the past 5-years UK Moon Sighting data, it is clear that if a few 29th-day sightings are missed (due to lack of sighters or clouds), it is automatically corrected by the end of the following month without accumulating (adding up) errors to the subsequent month. If we get wider community support for Local Sighting in the future, then this monthly data can be further improved, InshaAllah. []

It is well-known that Local Moon Sighting is the original position of the Shariah, as established from the Sunnah of the Prophet (ﷺ) and the Khulafa Rashideen (RA). However, since UK Muslims have been following different foreign countries for historical reasons, it was necessary to seek advice from those institutions that advised us to follow foreign countries in the first place. The question (Istiftaa) asked last year provided the past 4-years actual observation data with 2-years predicted crescent visibility (Imkan Al-Ruyat) data, to show that Local Moon Sighting is indeed possible. We have now received several fatawa to follow Local Moon Sighting, provided we seek the majority agreement, InshaAllah. []

There are many social/political benefits of uniting on Local Moon Sighing in a non-Muslim country (eg. to easily organise time off from work, education etc). However, this unity cannot be achieved by a few people doing Local Moon Sighting voluntarily to revive the Sunnah but will require the full support and commitment of the majority of UK Muslims (including the Imams, Scholars and Mosque Committees).

We have also received messages of support from senior UK ulama [2] to lead the change to Local Moon Sighting criteria and hence we have started an online consultation survey, seeking wider community support to change. Please complete the short survey as soon as possible (or by the end of Dhul Hijjah 1443/July 2022). []

Note that for historical reasons the current ICOUK Moon Sighting criteria is the UK to Morocco Region. Any change of criteria will require a few months' notice for publicity (and update of IT systems/Apps), as informed by the survey.

[1] During Major Lunar Standstills (once every 18.6 years), there may be a few months of consecutive 30-days, due to low altitude
[2] including from (a) Wifaqul Ulama (UK): “آپ کو چاہیے کہ مقامی رویت ہلال پر عمل کرنا شروع کر دیں [You (ICOUK) should start following Local Moon Sighting]”. (WhatsApp, 8/5/2022) [MP3] / (b) Jamiat-e-Ulama Britain (CMSC): “آپ مراکش کو چھوڑ سو فیصد مقامی رؤیت پر عمل کرنا شروع کریں [You  should leave Morocco and start following only Local Moon Sighting]” (WhatsApp, 23/6/2022)

(Adapted from a Testimony Panel presentation by Eng. Qamar Uddin; dated 7 September 2021) [download pdf] [YouTube]


There is a lot of confusion about the local (or regional) moon sighting boundary (Matla) amongst the Muslims. Some people consider that to be within their own country (eg. UK) and include neighbouring countries in the same region (eg. Morocco). Yet, some others consider the countries in the opposite Hemisphere is also included in the boundary (eg. South Africa or South America)! So, let’s explore these definitions from a technical and scientific perspective to see if we can define the local sighting boundary in the light of the Quran and Sunnah (using the Day and Night Maps).

Allah says: {وَالْقَمَرِ إِذَا تَلَاهَا ‎; وَالشَّمْسِ وَضُحَاهَا},

“And by the sun and its brightness; And by the moon, as it follows it (the sun)” [Quran 91:1-2]

In the commentary of the Quran (Tafsir Ibn Kathir), one of the eminent companions of the Prophet (ﷺ), Qatada (RA) said that this verse means, In the night of the crescent moon (Hilal), the moon must follow the sun. That is, the sun sets first and then the moon becomes visible (until the moon sets). So, this verse is telling us the sighting of the moon is between sunset to moonset. It is also well-known that sunset and moonset are related to a given location on earth and they (sunset and moonset) do not happen at the same time in all places of the earth.

Similarly, a number of authentic Ahadith mentioned that “If the sky is cloudy for you, then complete 30-days” (Muslim, Book 13/Hadith 6). It is well-known amongst the weather/meteorology experts that cloudiness is a local phenomenon and the entire country or the whole world is never cloudy at the same time. Hence, the Ahadith indicate Local Moon Sighting, as was the practice of the Prophet (ﷺ) and his Rightly Guided Khulafa Rashideen (Ref: Advice of Umar (RA) to the residents of the mountains to follow their own moon sighting – see ref [1])!

Definition of Local Boundary

We shall explain and define the boundary using the Day and Night maps based on the globe as given on various astronomy websites such as or etc.

1 DN Map ClearThe Day and Night maps indicate the sunset and sunrise times for every location on earth at regular intervals. They are then plotted on a world map so the curves can be seen through different dates (see Fig.1). If we consider the UK boundary and take the easternmost city (eg. Great Yarmouth) for the seasons, then we find that the difference between Sunset and Moonset is about 1 - 1.5 hours (using HMNAO Websurf Moon_Viz program).

For example, on 11 June 2021, the Moonset Lag time for Great Yarmouth (UK) is 81 mins (HMNAO/Code B), which varies slightly from month to month down to 60 mins (approx.). The difference between the sunset and the moonset for a given location is called the Moonset Lag time, which defines the limit of the Hilal visibility window. Note that the moon may not become visible until sometimes after the sunset due to solar glare. So, for all practical purposes, if we can share similar sunset and moonset times through all the areas of our locations (or cities) in a country, then we can say this is the Local Sighting boundary because of the same possibility of sighting the moon anywhere within that area. This definition of the Local Moon Sighting boundary (or Sharing of Night) is consistent with the Quran and Sunnah.

To define the Moon Sighting zone (Matla), let us consider the Day and Night Maps cover around the UK. Rather than going through all the 365 days of the year’s Day and Night Maps, we shall just choose four key dates as follows:

  1. Spring - when the Days and Nights are equal lengths (March),
  2. Summer - when the earth is tilting towards the Sun ie. longer Days and shorter Nights (June) and
  3. Autumn - when the Days and Nights are back to equal length (September),
  4. Winter - when the earth is tilting away from the Sun ie. shorter Days and longer Nights (December)
Hilal Visibility Window for Spring

2 DN Map SpringConsider the Day and Night Map for 21 March 2021 (Sunset at 18:10 GMT) in the East of the UK (Great Yarmouth). If we move West of the sunset point by 1 hour and 10 mins later, then we see that Sunset covers the whole of the UK from the East to the West.

Recall that the Moonset Lag time is about 80 mins (ie. 1 hour and 20 mins) for Great Yarmouth. So, using that Lag Time from the sunset on the Eastern point to the sunset on the Western point will be the width of the Hilal Visibility Window for the Spring season (see Fig.2).

Hilal Visibility Window for Summer

3 DN Map SummerNow, let us move to 21 June 2021, which is the longest day of the year in the Northern Hemisphere (as the Earth is tilted 23.5° towards the sun) and it will be the shortest day of the year in the Southern Hemisphere.

Looking at the Sunset curve at the Eastern point of the UK (Sunset at 21:20 BST), which is tilting from the top-right (East) towards the bottom-left (West), shows the neighbouring Regions (i.e. Europe and West Africa) have already past their Sunset and probably past their Moonset too.

If we now move 1 hour and 10 mins or so towards the West, that would be the Moonset point. As before, the width of the curve between the sunset and the moonset points is the Hilal Visibility Window for the Summer season, which is at that angle like a forward-slash / (see Fig.3).

Hilal Visibility Window for Autumn

4 DN Map AutumnLet us now move to 21 September 2021 (Autumn), which is similar to the Spring type of days and nights, where the length of days and nights are almost equal (ie. 12 hrs each), and the Hilal Visibility Window is also similar to in the Spring season. The Sunset is 18:55 BST in the East of the UK (Great Yarmouth). If we move West of the sunset point by 1 hour and 10 mins later, then we see that Sunset covers the whole of the UK from the East to the West. And again, using that Lag Time from the sunset on the Eastern point to the sunset on the Western point will be the width of the Hilal Visibility Window for the Autumn season (see Fig.4).

Hilal Visibility Window for Winter

5 DN Map WinterNow, let us move to 21 December 2021 (Sunset at 15:55 GMT), which is tilting from the top-left (West) towards the bottom-right (East). It is the shortest day of the year in the Northern Hemisphere (as the Earth is tilted 23.5° away from the sun) and it will be the longest day of the year in the Southern Hemisphere. If we now move 1 hour and 10 mins or so towards the West, that would be the Moonset point. As before, the width of the curve between the sunset and the moonset points is the Hilal Visibility Window for the Winter season, which is at that angle like a backward-slash \ (see Fig.5). Note that the neighbouring Regions (i.e. Europe and West Africa) are still in the day-time (early afternoon), well before their Sunsets.

Since the UK sunset is a few hours before the neighbouring Regions, it is possible to see the Hilal and start the month before them as was the case many years ago (eg. 2009), when the elliptical orbit of the moon was over the Northern Hemisphere, before the Southern Hemisphere (and in future during Major Lunar Standstills, eg. in 2025, 2043 etc)!

Hilal Visibility Window for all seasons

6 DN Map LocalIf we now replace all the previous Day and Night curves over the UK with the bandings for all four seasons (Spring, Summer, Autumn and Winter), then we will find they all form a diamond-shaped area that is shared through all seasons.

This method is similar to the Venn Diagram used in Mathematics, where we can say that the common area for all seasons of the Hilal Visibility Window is the area inside the diamond-shaped/triangle area. So that means, the moon would be visible within that area throughout all the seasons, but not outside that area because we are not sharing the Sunset to Moonset times of that area with other places on the globe (see Fig.6).

If we were to go through all the seasons daily, the diamond-shape will form into a circle because the world is a sphere (round) and not a flat plane. Note that the area under the circle is approximate in order to explain the concept of how to define the Local Areas or Local Boundary scientifically. But we can confidently say that this is the Local Sighting boundary because the probability of anyone sighting the moon within the circle is almost equal.

Regional Boundary (Exceptional Case)

7 DN Map RegionalLet us now consider the scenario if the moon was not seen for a few consecutive months due to Major Lunar Standstills, as was the case in 1987, 2006 etc (or totally cloudy). In such a situation, we may have to resort to finding other solutions for such a hardship to sight the moon for Ramadan and Eid. In such cases, we have to keep completing 30-days for a few months or expand our local area to the Local Region (i.e. Nearest Latitude/Aqrab Al-Balad) towards the Equator, as an Exceptional Case.

The question arises, what is the outer-limit of the Nearest Latitude or how far distance can we expand? We can use the area under the outer triangle as markers for the limit of expanding the Local Region because most of the time in the year (i.e. 3 out of 4 seasons or 8 out of 12 months), our Hilal Visibility Window will be the same in that region and for the other few months, it will be slightly before or slightly after the UK sunset times (see Fig.7). So, this is for the Exceptional Case (استثنائی حالات).

Note that this principle of the Nearest Latitude also agrees with the Fiqh ruling described in Allamah Dr Khalid Mahmood’s book, “Why Two Eids?”. It says in his book, “similarity of rising [visibility] time”. He also said that it is not correct that “Unity of Horizon” (Ittihad e Matale) or Global Sighting is the Hanafi position! That is not true. He says that the Hanafi scholars only use that for nearby locations and they rejected it for far distance countries. The concept of nearby countries also agrees with our current understanding of the world with global communications, which may not have been the case in the 15th century, but certainly, it is the case in the 21st century. That is, Unity of Horizons is only valid for locations within a reasonable distance because Time Zone differences make some parts of the world as night and other parts as day, hence the whole world can never have Unity of Horizon for moon sighting purposes!

Local Sighting Boundary of Kuraib Hadith

A question may arise, how does the above principle (using Day and Night maps) compare with historical facts? So, let us now fast backward in time to the 7th century and apply the same principle to the Kuraib Hadith as recorded in many books of Ahadith (e.g. Sahih Muslim) which highlights the Moon Sighting boundary (Matale). The Hadith mentions that a traveller from Madinah (Saudi Arabia) went to visit Damascus (Syria) where the crescent moon of Ramadan was sighted on Friday and when he returned to Madinah (before the end of Ramadan) he discovered that it was sighted on Saturday. However, Ibn Abbas (RA) did not back-date the start of Ramadan to the previous day based on the moon sighting by Mu'awiya (RA) in Damascus (a far distant city) and insisted on following the Local Moon Sighting of Madinah or completing 30-days, as commanded by the Prophet (ﷺ). Note that these two places mentioned in the Hadith (ie. Madinah and Damascus) are two capital cities in two far distant countries of the world mentioned in historical texts (and not like the neighbouring cities in the modern world within short distances).

8 DN Map SY SAIf we apply the same principle of the Hilal Visibility Window (using Day and Night maps) as explained above, we will find that the Local Moon Sighting of Damascus is different from that of Madinah. That is, they both have a separate area of Local Moon Sighting zones through all seasons and do not overlap with each other (see Fig.8). So, now we can use this explanation to support the Kuraib Hadith that both cities of the world had separate Sighting Zones. It was not as some people misunderstood that Damascus was in the West of Madinah and hence, they didn't follow it (or vice versa).

Now, let us fast forward from the Kuraib Hadith in the 7th century to the 14th century. That is the lifetime of Shaykh ul-Islam Ibn Taymiyyah (RA) who used to live in Damascus. He was a Hanbali scholar, but accepted by all Maslak, as a leading scholar of his time and he said in Majmua Fatawa (vol.13/p.62) that if there is a sighting in the East, then it must be sighted in the West but not the other way around (ولا ينعكس). What is not clear is that the distance between the East and West was the maximum travelling distance of their time through which the news can be conveyed. Realise that in the 14th century, news could not be conveyed from Australia to America (East to West) in one evening, especially when they are Day and Night apart. So, we can reasonably conclude that the ruling by Ibn Taymiyyah (RA) applies to the East-West of the Local Sighting zone, which also agrees with the Kuraib Hadith.

Summary of Moon Sighting Boundary

The Moon Sighting Zone (Matla) is defined as the Hilal Visibility Window that is shared through all seasons (using Day and Night maps) and it is under the same legal jurisdiction. However, if there is an exceptional case due to some hardships (Haraj) when the moon cannot be seen for many consecutive months on the 29th lunar date, then the Moon Sighting Boundary may be expanded to the Regional Sighting Zone where the visibility must be shared for most of the seasons. The Regional Sighting Zone could be interpreted as the old equivalent of Ittihad Matla (Unity of Horizons), which was commonly interpreted as “Global Sighting” in the past, but it should be interpreted as Regional Sighting in the 21st century. The expansion of the Local Sighting to Regional Sighting boundary should be only used for the duration of any hardships and not beyond that (e.g. while developing Sighting Locations in critical areas).

The above definition of the Local Moon Sighting Boundary is fully consistent with the Quran (2:189/ 9:36/ 91:1-2), Sunnah/Kuraib Hadith (Bukhari/Muslim), Fiqh (Ikhtilaf Al Matale) and Islamic History, as explained by Shaykh ul-Islam Ibn Taymiyyah (RA) in the 14th century Damascus (Syria). It is also consistent with the advice of Khulafa Rashideen, such as Umar (RA) to the residents of the mountains to follow their own moon sighting, even if it differs from other regions![1] Note also, the Prophet (ﷺ) said: {فَعَلَيْكُمْ بِسُنَّتِي وَسُنَّةِ الْخُلَفَاءِ الرَّاشِدِينَ الْمَهْدِيينَ}, “Follow my Sunnah and the Sunnah of the Khulafa ar-Rashideen” (AbuDawud, Book 42/Hadith 12) (Tirmidhi, Book 41/Hadith 32).

Therefore, it can be safely concluded that following Local Moon Sighting by the British Muslims from within the British Isles is fully consistent with the Quran and Sunnah. We hope and pray that the UK Muslims will support their Imams and Scholars to unite on Local Moon Sighting, sooner than later, InshaAllah. [Qamar Uddin / June 2022]

Reference: UK Moon Sighting Fatawa 1443/2022 (English/Urdu PDF, 56 pages, 38 MB) / [YouTube: Kuraib Hadith on Local Moon Sighting]


[1] Ghareeb al-Hadith, Imam Abu Suleiman al-Khattabi, Vol. 2/P.103, Umm al-Qura University, Makkah, Saudi Arabia.

Checked by: Maulana Abdullah Ahmed

Many people who use Weather Forecast to decide if they can put out their washing for drying (or stargazing from directly above their head/zenith), also use the same logic to decide if they should go out for moon sighting or not (when it’s predicted to be visible)?

The above comparison is not correct since the distance to the horizon is usually much further away from the observation location than the horizon (where the weather forecast could be clear skies)!

The reason the actual weather may be much better at the horizon is because, cloudiness is a local phenomenon i.e. the whole region is never (or very rarely) cloudy at the same time, such that two locations, 10 – 20 miles apart may have totally different weather conditions (clear and cloudy).

The question arises, how far distance is your horizon (l) so you can estimate the weather forecast more accurately? The answer to that depends on both the height of your observation location (which is variable, h) and the radius of the earth (which is a constant, R = 3959 miles), as given in the formula below:

HorizonDiagramDistance to the horizon (l) = 1.22495 √h where h is in feet and l is in miles OR
Distance to the horizon (l) = 3.56972 √h where h is in meters and l is in kilometres (km)

1. What is the distance to the horizon for someone at 10m height of location and 1.5m tall? Distance = 1.22495 x √(32.8 + 5) = 7.53 miles OR = 3.56972 √(10 + 1.5) = 12.12 km
2. What is the distance to the horizon for someone at 1000 ft height of location and 6ft tall? Distance = 1.22495 x √(1000 + 6) = 38.84 miles OR = 3.56972 √(305 + 1.8) = 62.51 km

The above example calculations are for York (height, 10 m) and Thirsk (height, 1000 ft) in North Yorkshire.

DistanceToHorizonTable1 It is clear from the above calculations that the higher the location, the further away the horizon will be and hence the weather at that distance may not be as cloudy as the location of the observer.

Furthermore, when it’s partly cloudy, it has been found that the location near sunset may have a clear gap, allowing the moon to be easily seen, even though other parts of the skies are totally cloudy.

Therefore, never give up looking for the moon (until moon set times), even if the forecast is cloudy, since there may be a clear gap to see the moon through a break in the clouds (at the horizon)!

Note that it is advisable to use the first part of your postcode (eg. YO10) for the UK regional weather forecasts (which may include locations near your distant horizons).

Ref: How far away is the horizon? (PDF) | See also: How to Calculate the Distance to the Horizon

Related: First day's moon on UK horizon | Met Office UK weather map

If you have any comments regarding the above article, please email us via our on-line Contact Us form.


To establish the Hijri calendar with verified moon sightings by the human eye (Muhaqaq Ruyat Basari) is a communal obligation (Fard Al-Kifaya). The role of the public is to sight the moon and report it. The role of the Hilal Committee is to take the witness testimonies (Shahada) and declare the start of the lunar months (for Ibadah). Anyone who has sent a Hilal Report to the ICOUK website ( may be invited to give a testimony to ICOUK Ulama according to this policy, which may be shared confidentially (see below) with other UK Hilal Committees/Organisations (to avoid inconveniencing the witnesses with multiple testimonies).

Witness Criteria

The vast majority of the ICOUK members follow the Quran and Sunnah according to the understanding of the Hanafi Madhab (school of thought), which has the most stringent witness criteria. Accordingly, the witness must be (a) Muslim, (b) adult, (c) sane (sound mind), (d) has good eyesight, (e) reliable/good character etc.

Number of Witnesses

A minimum of two males or two females and a male witness will be required*, although a greater number is most welcomed. If a female is unable to provide a testimony directly to the ICOUK Ulama, then she can still provide it through a male guardian (Mahram), known as Testimony-upon-Testimony (Shahada-Ala-Shahada)!

[*Note: In the case of cloudy weather at the start of Ramadan, the witness of one trustworthy male or female is accepted. For clear skies, a large group sighting (Jame Ghafeer) will be necessary.]

Remote Testimony

To help the UK Ulama/Hilal Committees make rapid and accurate Hilal decisions, we will adopt a remote testimony procedure via an audio/video conference call (e.g. Skype/Zoom). Remote testimonies will be taken individually from those who have sent (positive) ICOUK Hilal Reports and whose full identity (ID) are known to the Admins. Therefore, it is important to keep your ICOUK database profile up to date with your contact details and a recent ID Photo (of head and shoulders).

Identity Verification

An ID Photo is very helpful to establish the identity of witnesses with minimum delays. A remote testimony from a stranger (unknown person) is not acceptable. The identity of males and females will be verified separately by male and female Admins and Scholars, respectively. Once the identity has been established, a voice-only testimony (i.e. with video off) may be acceptable, InshaAllah.

Testimony Template

All witnesses will be required to use the template below, by adding the details inside the angle brackets (< >). 

My name is <full name> and I am from <city/town>. I testify that I saw the moon on <date/time> <before/after> sunset. The sky was <clear/cloudy> and the moon was seen on the <left/right> of sunset by <naked eye/binoculars>. The time of sunset was <hh:mm GMT/BST>.

The witnesses may be asked to provide some additional information (e.g. direction of the crescent moon horns), but the template details are the minimum required for Shariah and Scientific purposes.



Once the testimonies have been accepted by the ICOUK Ulama/UK Hilal Committees, the decision to start the month will be announced on the ICOUK website and/or social media channels. Other organisations may do the same via their own websites/social media channels. Note that the announcements for negative sighting reports are always later (than positive sighting reports), to allow the extra time for receiving all the observation results from the last sighting point/moonset time!

Confidentiality/Privacy Policy

Any testimonies provided to the ICOUK Ulama above may be shared confidentially with other UK Hilal Committees under a Non-Disclosure Agreement (NDA). All other personal details of the witnesses will be kept strictly confidential, as per ICOUK Privacy Policy and will not be disclosed to any third parties without the prior consent of the testimony provider.

Related: Importance of Moon Sighting | Importance of Reporting Hilal Sightings | Regional (Hilal) Testimony Coordinator Role (pdf)
Reference: Fatwa Jamia-Uloom Islamiyyah, Pakistan (2022) | Video Testimony Fatwa by Jamia Tur Rasheed, Pakistan (2018) [p.10]

If you have any comments regarding the above article, please email us via our on-line Contact Us form.