ʾAbū Saʿīd al-Siǧzī was a prominent fourth/tenth century astronomer and mathematician who was one of the first contributors to the new genre of ʿilm al-hayʾa (science of the configuration). However, little is known about the initial steps taken in the formation of the discipline, or its independence from other astronomical writings and practices. In this paper, I will discuss new findings about Siǧzī’s life to determine details of his biography and a more precise time period for his scientific activities. I then describe, for the first time, a composition in theoretical astronomy from the fourth/tenth century, the “Structure of the orbs” (Tarkīb al-aflāk) by Siǧzī to show its place in the formation of the discipline of ʿilm al-hayʾa, comparing Siǧzī’s book to the earlier work of al-Farġānī on the size of the earth and the number of celestial spheres. I conclude that Siǧzī’s Tarkīb al-aflāk is the earliest known example of a book that contains only topics found in later hayʾa and may be the first appearance of the ninth celestial orb that became standard in the later genre.

中文翻译：

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ʾABŪ SAʿĪD AL-SIǦZĪ 和“天体的结构”，HAYʾA 上已知最早的作品

ʾAbū Saʿīd al-Siǧzī 是 4/10 世纪一位杰出的天文学家和数学家，他是新流派的首批贡献者之一。ʿilm al-hay一种（配置科学）。然而，关于形成该学科所采取的最初步骤，或者它独立于其他天文学著作和实践，人们知之甚少。在本文中，我将讨论关于 Siǧzī 生平的新发现，以确定他的传记细节和更准确的科学活动时间段。然后，我第一次描述了四世纪/十世纪的理论天文学作品，“天体结构”（塔基布·阿弗拉克) 由 Siǧzī 显示其在学科形成中的地位ʿilm al-hay一种，将 Siǧzī 的书与 al-Farġānī 早期关于地球大小和天球数量的著作进行比较。我的结论是 Siǧzī 的塔基布·阿弗拉克是已知最早的一本书的例子，它只包含后来发现的主题干草一种并且可能是后来成为标准的第九天球的第一次出现。