Crescent Observer's Society of South Africa

Determining whether the new crescent moon can be seen after sunset is a question that has fascinated astronomers and moon sighting committees for centuries. Modern astronomy provides several models that help estimate the probability of crescent visibility. Two of the most well-known approaches are the Yallop criterion and the van Gent method. These models do…

I trust this letter reaches everyone in the best of health and eagerly awaiting the auspicious month of Ramadaan 2026. We will embark with our Ramadaan 1447 Appeal to prepare 250 food parcels for those less fortunate. For those who wish to contribute any form of cash donations, sadakah, fitra, fidya, and lilah, we will…

In this video, the chairman of the Crescent Observers Society of South Africa (COSSA), Sh Safwaan Sasman explains the role of the society. COSSA was established in 1953 under the MJC. It was mandated to follow a set religious procedures for sighting the new moon each month. For more than 50 years it has performed…