Sighting the Crescent: How the Islamic Months Begin

Preparing for Ramadan or Dhu’l-Hijja brings a question: how is the first day identified? The answer involves both the Moon and the method used to mark a month’s beginning. Understanding these distinct questions helps make sense of calendars that give different dates, while keeping attention on the meaning of the coming month.

A Calendar Measured by the Moon

The U.S. Naval Observatory’s Islamic calendar reference describes lunar months beginning when the thin crescent is sighted in the western sky after sunset, a day or so after New Moon. It describes unaided-eye sighting for this calendar purpose. The visible crescent and the astronomical New Moon therefore need to be distinguished when reading an explanation of when a month begins.

Twelve lunar months are, on average, about eleven days shorter than the civil year. The Islamic year consequently moves earlier through the civil calendar by about that amount each year. Ramadan’s changing civil dates reflect this difference between the two calendars. A civil date identifies where the lunar month falls in a particular year; it does not fix that month permanently to the same season.

The Observatory dates the calendar’s year count from 1 Muharram AH 1, corresponding to Friday, July 16, 622 CE in the Julian calendar. That historical date uses the Julian calendar designation given by the reference. Its list of months identifies Muharram, Rajab, Dhu’l-Qa’da, and Dhu’l-Hijja as holy months, and Ramadan as the month of fasting.

The reference also describes a tabular Islamic calendar established for some non-religious purposes, with months alternating between 29 and 30 days. Such a table describes a calendar arrangement; a sighting report describes an observation. Reading the description attached to a calendar helps identify which kind of information it supplies.

Why the New Crescent Is Hard to See

According to the Observatory’s explanation of crescent visibility, the date and time of New Moon can be computed exactly, while the visibility of the young crescent cannot be predicted with certainty. During the first two days after New Moon, the crescent appears low in the western sky after sunset, against bright twilight, and sets shortly afterwards.

Seeing it within one day of New Moon is usually difficult. The crescent is thin and faint, and twilight can obscure it. Experienced observers in suitable locations with good sky conditions can generally see it about a day after New Moon, but the interval varies from month to month. Sky conditions, location, experience, and preparation all affect what an observer can see.

This distinction helps when reading a prediction: the Moon’s age, counted from New Moon, is only one part of the visibility question. A calculated moment alone does not describe the full circumstances of an attempted sighting. The conditions of observation matter alongside the timing.

The Observatory notes that observers at low latitudes and high altitudes who know where and when to look are generally favored. Those circumstances help explain why visibility is discussed in relation to a location rather than solely as elapsed hours.

Sighting and Calculation

The Fiqh Council of North America (FCNA) publishes a calculated calendar. Its calendar explanation and date table describe criteria following the European Council for Fatwa and Research (ECFR). After conjunction, somewhere on the globe at local sunset, the angle between the Sun and Moon must be at least 8°, and the Moon must be at least 5° above the horizon. Under FCNA’s stated method, meeting these conditions places the month’s beginning on the following day; otherwise, it begins the day after that.

These figures describe FCNA’s method. They identify a calculation criterion rather than a report that an observer at a particular location has seen the crescent. A calendar based on that criterion and an announcement awaiting a locally confirmed sighting can therefore answer the month-beginning question differently. Keeping the named method with the date makes the announcement easier to understand.

A Borderline Month: Ramadan 1447

FCNA’s Ramadan and Shawwal 1447 announcement illustrates the difficulty. It placed the first fasting day of Ramadan on Wednesday, February 18, 2026. The announcement also explained that the numerical thresholds were technically met in an unusually borderline case: the Moon was extremely young, with very little illumination, leaving practical visibility severely limited.

The same explanation reported that Diyanet in Turkey and, following it, the ECFR concluded that the crescent would not be practically sightable anywhere on Earth on February 17. FCNA said that much of the world might consequently begin fasting on Thursday, February 19. Its wording describes a possibility, rather than confirming what every community ultimately did.

For Shawwal 1447, FCNA gave Friday, March 20, 2026 as its calculated first day and Eid al-Fitr. Reading the Ramadan explanation alongside that date shows why an announcement’s method and qualifications deserve attention as well as its civil-calendar date.

Looking Ahead to 1448

The following are calculated dates in FCNA’s calendar for 1448 AH. Each is a calculated date and may differ from a locally confirmed sighting:

The year label matters: Ramadan 1447 and Ramadan 1448 correspond to different civil years in these examples. Keeping the Islamic year, the civil date, and the calculating body together avoids confusing one announcement with another. The dates above belong to FCNA’s calculation; they do not report a local observation of the crescent.

Eid al-Adha and the Day of Arafah

FCNA separately states that Eid al-Adha will be the day after the Day of Arafah as determined by the Supreme Court of Saudi Arabia. Its Ramadan announcement describes this as following the Hajj authorities’ announcement in Makkah regarding Arafah. That stated approach is distinct from simply reading the first day of Dhu’l-Hijja in its calculated table.

For the devotional context, the article on the blessed ten days of Dhu’l-Hijja offers a companion reading, while Welcoming Ramadan turns to preparation for the fasting month.