As Muslims across Nigeria and other parts of the world await the sighting of the moon to mark the end of Ramadan, one question often comes up: why does the fasting month sometimes last 29 days and other times 30?

This year, with no confirmed sighting of the new moon on the 29th day of Ramadan, Muslims will complete 30 days of fasting. While this may seem uncertain to some, it is actually in line with Islamic teachings and the way the lunar calendar works.

The Islamic calendar is based on the moon

Unlike the Gregorian calendar, which follows the sun, the Islamic calendar is based on the lunar cycle. Each month begins with the sighting of the new crescent moon.

Because the moon’s cycle is about 29.5 days, Islamic months are either 29 or 30 days long. There is no fixed number of days for any month, including Ramadan.

This is why the start and end of Ramadan depend on moon sighting rather than a fixed date.

Moon sighting determines the end of Ramadan

The end of Ramadan is confirmed by the sighting of the new moon, which signals the beginning of the next month, Shawwal.

If the moon is sighted on the 29th day of Ramadan, the fasting ends, and the next day becomes Eid al-Fitr. However, if the moon is not sighted, Muslims complete 30 days of fasting.

This method is based on the teachings of the Prophet Muhammad, who instructed Muslims to begin and end fasting based on moon sighting.

Weather and visibility can affect sighting

In many cases, the moon may be present but not visible due to weather conditions such as clouds, dust, or haze.

This is common in some parts of Nigeria, where atmospheric conditions can make it difficult to sight the crescent moon clearly.

When this happens, Islamic authorities rely on confirmed and credible sightings. If no reliable sighting is reported, Ramadan is completed as 30 days.

Different countries may have different dates

It is also common for different countries to begin and end Ramadan on different days. This is because moon sighting is often done locally or regionally.

While some countries rely strictly on physical sighting, others may use astronomical calculations to support the process.

As a result, Eid al-Fitr may be observed on different days across the world.

A system rooted in simplicity

The use of moon sighting in Islam is meant to be simple and accessible. It does not require advanced tools or technology, making it possible for communities to determine important dates based on natural observation.

This system has been followed for centuries and remains an important part of Islamic practice.

Completing the month with patience

When Ramadan extends to 30 days, it is not seen as a burden but as part of the natural cycle of the lunar calendar.

For many Muslims, completing the full 30 days is also an opportunity to maximise the final moments of the month through prayer, reflection, and acts of charity.

In the end, whether Ramadan lasts 29 or 30 days, the purpose remains a period of spiritual growth, self-control, reflection, and renewed faith.