Isaac ben Solomon Ibn al-Ḥadib (or al-Aḥdab) emigrated from Castile to Sicily no later than 1396. In astronomy, his most important work, written in Hebrew, is The paved way (Oraḥ selula), a set of tables for the motions of the Sun and the Moon. Here, we focus attention on his unusual tables for finding the difference in time and the difference in longitude between mean and true syzygy, where syzygy refers to the conjunction and opposition of the Sun and the Moon. It is shown that he took into account the effect of Ptolemy’s second lunar model on the velocity of the Moon at syzygy, which was done by very few astronomers in the Middle Ages. It is also noteworthy that he took some parameters from the zij of al-Battānī and others from the Parisian Alfonsine Tables, using them inconsistently in these tables.

中文翻译：

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Ibn al-Ḥadib 寻找真正合子的表

Isaac ben Solomon Ibn al-Ḥadib（或 al-Aḥdab）不迟于 1396 年从卡斯蒂利亚移民到西西里岛。 在天文学中，他最重要的著作是用希伯来语写成的，是铺砌的道路 (Oraḥ selula)，这是一套用于太阳和月亮的运动。在这里，我们将注意力集中在他的不同寻常的表格上，用于找出平均和真实 syzygy 之间的时间差异和经度差异，其中 syzygy 是指太阳和月亮的合相和对相。结果表明，他在 syzygy 时考虑了托勒密的第二个月球模型对月球速度的影响，这在中世纪由极少数天文学家完成。还值得注意的是，他从 al-Battānī 的 zij 中获取了一些参数，而在这些表中使用了不一致的参数。