Yazdi, Hamid-Reza Giahi (Author)
This article deals with an unstudied criterion for determining lunar crescent visibility, which appears in the Mufrad Zīj, compiled by Ḥāsib al-Ṭabarī (5th c. A.H./11th c. A.D.). Al-Ṭabarī attributes this circular criterion to Al-Bīrūnī. 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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