New Crescent Society

Imad Ahmed Many people have contacted New Crescent Society asking: Can you give us the dates for the Islamic calendar for 2021, based on local UK moonsighting? We will provide one in this blog piece. Please note that this is not a definitive calendar , but a predicted one, based on moon visibility data in the UK. A moonsighting-based calendar can only be determined by moonsighting on the day of sighting month on month. (Before you continue, please do take a read about the problem of the UK calendar , and our proposed solution .) How has this predicted calendar been calculated? This predicted calendar is based on UK moon visibility data. We have looked at this data for the 29 th of each Islamic month, and then: If the moon is predicted ‘visible’ in the UK, that month will have 29 days, and the new month will now begin. If the moon is predicted ‘not visible’ in the UK, that month will have 30 days, and the new month will begin a day later Further notes on the data used: The visibility d