وينبغي للناس أن يلتمسوا الهلال في اليوم التاسع والعشرين من شعبان
Translation: People should look for the crescent on the twenty-ninth of Shaʿban.
A lunar month lasts 29 or 30 days. The search is therefore made as the twenty-ninth day of Shaʿban ends, to determine whether Ramadan has begun. Yaltamisū means to seek or look for.
Although the text refers to the twenty-ninth day, the relevant observation is at its sunset, the start of the night that would precede the first day of Ramadan.
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Kitab al-Sawm: Crescent Sighting and Establishing Ramadan
وينبغي للناس أن يلتمسوا الهلال في اليوم التاسع والعشرين من شعبان
Translation: People should look for the crescent on the twenty-ninth of Shaʿban.
A lunar month lasts 29 or 30 days. The search is therefore made as the twenty-ninth day of Shaʿban ends, to determine whether Ramadan has begun. Yaltamisū means to seek or look for.
Although the text refers to the twenty-ninth day, the relevant observation is at its sunset, the start of the night that would precede the first day of Ramadan.