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Transition to Astronomical Calculations

By Louay Safi

The FCNA’s (Fiqh Council of North America’s) ruling in favor of using astronomical calculations for determining the beginning of the Muslim lunar month provoked a strong response which shows American Muslims are divided on the issue.

Scholars on both sides present arguments rooted in Islamic traditions, and often support their views by citing the same Qur’anic and Prophetic sources, or by referring to established tenets of Shari’ah. Therefore the difference of opinion is based on the reading of the sources rather than the sources themselves.

The arguments for relying on sighting the new crescent as a means to determine the Islamic calendar confound religious duties with empirical knowledge and practical skills required to identify the days on which these religious duties commence.

Observing Ramadan and performing hajj is ‘ibadah (religious duty), but observing the birth of the new crescent to determine the beginning of the lunar month is not.

The latter relates to the human capacity for determining the birth of the new crescent, and it is a function of the observer’s scientific and physical capacity to identify the moment of the birth of the new crescent with increased precision. This capacity to determine the beginning time of an act of worship varies, needless to say, with the knowledge of the position of the new crescent in the sky, the sharpness of the eye-sight of the observer, the access to refined tools, the climatic conditions, etc.

Although some Muslims tried to root the practice of moon sighting, particularly for the month of Ramadan, in the Qur`anic and Prophetic injunctions, a closer examination of the Qur’an shows that it regards fasting of Ramadan and performing of hajj as religious obligations, but considers the sun and moon movements as part of the natural order.

The Prophet (s), indeed, directed the Companions to establish the first day of Ramadan by sighting the moon, but then he stated that the reason for his directive was the inability of the early Muslim community to provide accurate calculation. The community, he pointed out, was then illiterate and had not mastered reading, writing, or calculation. They had no experienced astronomers with access to the knowledge, tools, and facilities to determine with accuracy the beginning of the lunar month. Consequently, the moon sighting was the only tool available for the early Muslim community.

If the distinction between these two areas of knowledge is confirmed, then the only reason for moon sighting to be favored over astronomical calculation is when the former is more accurate in determining the birth of the new crescent than the latter.

Early Muslim scholars agreed, by and large, on moon sighting as the only acceptable way for determining the beginning of the new lunar month.

However, their consensus was greatly influenced by the state of the science of astronomy, as well as the lack of direct access by the scattered Muslim villages and towns to reliable astronomers.

The consensus reached by early Muslim jurists on rejecting astronomical methods resulted from the lack of any clear line of demarcation between astronomy and astrology. Most early Muslim scholars equated astronomy with magic and fortunetelling.

The basis of the historical consensus on moon sighting has changed. Today, astronomers can calculate with great precision the date and time of birth of the new moon. Moon sighting, on the other hand, has become less reliable, as the conditions of the sky and the observers themselves have deteriorated markedly over the last two centuries. Muslims live not only in middle latitude regions of mostly clear sky—as was the case in the early years of Islam—but also in high latitude regions where the moon can rarely be sighted, and in areas of high humidity and frequent rain. The sky conditions have worsened in most inhabited regions.

Observation of the new moon is quite difficult in countries where Muslims do not employ the service of qualified observers using advance tools and facilities. Communities in the United States, for instance, rely on claims by ordinary Muslims with limited experience and astronomical knowledge. Even in Muslim countries where fairly advanced facilities are available, religious authorities accept the sighting of laymen with little or no training.

It must be asserted, therefore, that astronomical calculations provide a higher degree of certainty than an actual moon sighting. For while astronomical calculation provide a precise date and time of the birth of the new moon, sighing the moon produces, even with the use of advanced telescopes, less accurate and reliable results.

Yet the actual choice is not one in which we are asked to choose between astronomical calculation and moon sighting. The choice in fact is really between calculations and individual testimonies. For several centuries, the Hanafi school of fiqh required that every qualified person must go to open fields outside his village and town to observe the new moon. Other schools of fiqh required two qualified witnesses, in some cases one, to verify the actual sighting of the moon. The Hanafi school ultimately abandoned the group requirement, and followed the practice of verifying the sighting by two witnesses.

Those who insist that Muslims abandon astronomical calculation and rely on individual testimonies are in actuality asking Muslims to abandon the certainty of reliable knowledge in exchange for inconsistent and unverifiable individual reports. Individual reports, every student of fiqh knows, produce uncertain knowledge (ma’rifah zaniyah). This is amply illustrated by the established records of moon sighting testimonies. These testimonies have been exceedingly inconsistent, and have resulted in numerous contradictions and reversals.

There is ample evidence to convince anyone who is familiar with both Shari’ah injunctions and contemporary astronomy that astronomical calculations provide a more reliable and certain approach for determining the beginning of the Islamic lunar calendar. The fact that contemporary Muslim scholars are reluctant to embrace this certainty underscores the challenges facing contemporary Muslim scholarship.

The FCNA’s decision to formally adopt astronomical calculation represents a major step forward in overcoming historical inertia. Although the decision of the FCNA has not so far brought about a consensus among North American Muslims, it has set the foundation for the development of a position that can potentially bring a new consensus in deciding the beginning of Ramadan and the two Eids for the world-wide Muslim community.


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