Muslims around the world observe fasting during the month of Ramadan, but the precise moment the fast begins changes every day. The start of the fast is determined by the sighting of the crescent moon and calculated astronomical times, which vary by location and season.
Below is a detailed overview of when Muslims break their fast, along with key times for the pre-dawn meal, the moment the fast is lifted, and related spiritual practices. Use this guide to align your routine with authentic Islamic timings.
| Term | Meaning | Approximate Daily Change | How It Is Determined |
|---|---|---|---|
| Sehar / Suhoor | Pre-dawn meal taken before Fajr | Shifts by ~50 minutes daily | Based on Fajr al-Sadiq, the true dawn prayer time |
| Fajr | Dawn prayer time | Shifts by ~50 minutes daily | Calculated from sunrise when the sun is 12–15 degrees below horizon |
| Iftar | Time to break the fast at sunset | Shifts by ~50 minutes daily | Marked by the disappearance of the sun below the horizon |
| Maghrib | Evening prayer time | Shifts by ~50 minutes daily | Immediately after sunset, confirmed by twilight disappearance |
| Eid al-Fitr Start | Festival marking the end of Ramadan | Moves 10–11 days earlier each year in Gregorian calendar | Based on moon sighting committees and astronomical calculations |
Understanding Sehar and the Fajr Prayer Time
Sehar is the last meal before the fast begins, and it must be completed before Fajr. Fajr time is not the same as sunrise; it is calculated when the sun reaches approximately 12 to 15 degrees below the horizon. Missing Sehar even by a few minutes invalidates the fast, so many Muslims rely on digital Islamic calendars and prayer apps calibrated to their exact coordinates.
How Sehar Time Is Calculated
Islamic timekeeping uses astronomical calculations rather than simple sunrise tables. Scholars debate the exact twilight angle, which leads to slight differences between global Muslim organizations. Urban buildings, mountains, and weather can also affect the practical visibility of dawn, so local mosque announcements often serve as the final reference.
Iftar Moments: When the Fast Is Lifted at Sunset
Iftar occurs once the sun has completely set below the horizon, which is known as Maghrib. The fast is broken at this precise moment, and it is recommended to do so with dates and water following the tradition of the Prophet Muhammad. Delaying Iftar without a valid reason is discouraged, while hastening it at the first sign of sunset is also not allowed unless confirmed by astronomical signs or official announcements.
Moon Sighting and Its Role in Iftar
In many regions, local moon sighting committees visually confirm the crescent moon to declare the end of the day. If the moon is not visible due to clouds or latitude, scholars rely on calculations, sometimes accepting astronomical new moons as evidence. This process ensures that Iftar is observed on the same day worldwide, even when methods differ slightly.
Geographic and Seasonal Impact on Fasting Hours
The length of the fasting window changes dramatically depending on where you live and the time of year. In tropical cities near the equator, day and night are nearly equal year-round, while higher latitudes can experience extremely long summer days or very short winter days. Some Muslims in polar regions follow the time zone of Mecca, while others adhere to the nearest practical schedule, depending on community guidance.
Adjusting for Long Summer Days
In northern countries during summer, the fast can last 18–20 hours, which poses health risks. Medical professionals advise against fasting for those with chronic conditions, and many scholars allow alternative forms of worship, such as feeding the needy, for those unable to sustain such long hours without harm.
Regional Differences in Iftar and Sehar Times
Two people praying in different countries may begin and end their fast hours apart, even on the same night. Coastal cities, mountain valleys, and urban skylines all influence when twilight fades and dawn appears. National television channels, mosque loudspeakers, and mobile apps broadcast local times to help communities stay synchronized.
Standardized Prayer Time Calculations
Organizations like ISNA, MWL, and various national Fatwa councils publish standardized tables. While these reduce confusion, local mosques often issue final adjustments based on on-the-ground observations. Muslims are encouraged to follow a reliable method consistently rather than frequently switching between calculations.
Key Takeaways for Fasting Practice
- Sehar must end before Fajr; plan your wake-up time based on accurate local Fajr calculations.
- Iftar begins at true sunset, not at the moment Maghrib prayer starts.
- Use reliable, location-specific prayer time apps, especially during seasonal extremes.
- Follow a consistent method for moon sightings and calculations to avoid confusion.
- Prioritize health; consult medical professionals if long fasting hours worsen existing conditions.
FAQ
Reader questions
What if I miss Sehar and wake up after Fajr?
If you wake up after Fajr and realize you missed Sehar, you must stop eating and drinking immediately. You continue with the fast for that day and make up the missed fast later; no expiation is required beyond fulfilling the missed obligation.
Can I break my fast a few minutes before Maghrib if I am very tired?
No, the fast must not be broken before the true Maghrib time. Even if you feel exhausted, you should wait until the sun has completely set. In cases of genuine illness where fasting causes harm, breaking the fast is permitted, but this must be verified by a trusted medical professional.
Do all Muslim countries announce the same Iftar time?
Not necessarily. Different countries use different moon sighting criteria or calculation methods, so Iftar times can vary by a few minutes across borders. Travelers are advised to follow the local schedule of the country they are in while maintaining respect for neighboring communities.
What technology do mosques use to determine exact Iftar time?
Many mosques rely on software that calculates sunset based on geographic coordinates, taking into account atmospheric refraction and local horizon features. Some combine this with traditional moon sighting, especially for Eid, to ensure both astronomical precision and religious observance.