Al-Musnad: The forty-day period of winter (Al-Murabba'aniyah) is upon us tomorrow, and the nights will grow longer until December 22nd.

Dr. Abdullah Al-Musnad, a former professor of climate at Qassim University, revealed that the Al-Murabba’aniyah season will begin tomorrow, Sunday, according to some astronomical calculations. He explained that the date of the start of Al-Murabba’aniyah varies between astronomical schools, with dates ranging between December 1 and 7 of each year.

Ibn Bassam and the established history of the forty-day period

Al-Musnad pointed out that Ibn Bassam’s astronomical calculations make December 1st the fixed date for the beginning of Al-Murabba’aniyah annually, which corresponds to tomorrow, 2025.

The night gets longer and the day gets shorter

Al-Musnad explained that the night gradually gets longer during this period, with the day getting shorter by about 38 seconds daily, and this will continue until December 22, the day when the night reaches its longest duration before daylight hours begin to gradually increase.