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Islamic Astronomy
Moon Sighting in Islam
Discover the sacred practice of Rukyah al-Hilal — how the sighting of the new crescent moon guides the Islamic calendar, marks the beginning of sacred months, and connects the Ummah to centuries of tradition.
Ru'yat al-Hilal
Moon Sighting
Moon sighting, known in Arabic as Ru'yat al-Hilal, is the practice of observing the crescent moon to determine the start of a new Islamic month. It is a tradition deeply rooted in Islamic scholarship and continues to guide Muslim communities around the world in aligning their religious and social calendars.
In Islam, the lunar calendar is central to religious life. The sighting of the crescent moon marks the beginning of each new month and is essential for determining the dates of major Islamic observances, including the start of Ramadan, the celebration of Eid al-Fitr, Eid al-Adha, the beginning of Muharram, and other significant events in the Islamic year.
Muslim communities rely on verified moon sighting reports to prepare for fasting, prayer gatherings, and celebrations. Whether observed locally or confirmed through trusted Islamic authorities, moon sighting remains one of the most meaningful shared practices connecting Muslims across generations and geographies.
Why It Matters
The Importance of Moon Sighting
Moon sighting is not simply a calendar matter — it is an act of worship and a communal responsibility for Muslim communities. Understanding why it matters helps contextualise the significance of reliable moon sighting announcements.
- The Islamic calendar follows the lunar cycle, with months tied directly to the phases of the moon.
- Each Islamic month begins only upon the confirmed sighting of the crescent moon (Hilal).
- Moon sighting has been practised since the time of the Prophet Muhammad (PBUH), who instructed Muslims to begin Ramadan and Eid upon sighting the moon.
- Accurate moon sighting announcements ensure that communities fast, pray, and celebrate in alignment with Islamic guidance.
- Moon sighting decisions affect millions of Muslims globally and carry both spiritual and communal significance.
Together, these factors demonstrate why accurate moon sighting information remains an important part of Islamic religious life and community coordination.
Reliable and timely moon sighting announcements are a service to the entire Muslim community. allMasajid is committed to sharing trusted moon sighting information to help communities stay connected and informed.
The Hijri Calendar
How Islamic Months Are Determined
The Islamic lunar calendar, known as the Hijri calendar, consists of twelve months, each beginning with the sighting of the crescent moon. Understanding how Islamic months are determined helps Muslims appreciate the significance of moon sighting reports.
Islamic Month Length
Each month contains either 29 or 30 days, depending on when the crescent moon is sighted.
The Role of Hilal
The Hilal, or crescent moon, must be visibly observed to confirm the start of a new month.
Sighting Reports
Moon sighting reports are reviewed by Islamic scholars and committees before an official announcement is made.
Regional Variation
Moon sighting announcements may vary between countries and regions due to differences in horizon visibility, local scholarly opinion, and adopted methodology.
It is important to note that differences in moon sighting announcements between regions do not represent conflict — they reflect the diversity of scholarly opinion and geographical considerations that have always been a part of Islamic practice.
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