Abstract
This article deals with an unstudied criterion for determining lunar crescent visibility, which appears in the Mufrad Z $$\bar{\iota }$$ j, (compiled by Ḥāsib al-Ṭabar $$\bar{\upiota }$$ , 5thc.A.H./11th c.A.D.). Al-Ṭabar $$\bar{\upiota }$$ attributes this circular criterion to Al-B $$\bar{\upiota }$$ rūn $$\bar{\upiota }$$ . Initially, Prof. David King shed light on this criterion in 1987 and explained it briefly. We will examine this criterion by re-computing the underlying numerical values to reconstruct it, in order to demonstrate that it originates from Ḥabash’s simple criterion.
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