astronomy

Yahya ibn Abi Mansur

Yahya ibn Abi Mansur is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Yahya ibn Abi Mansur rather than just read about it. In short: Yahya ibn Abi Mansur (Arabic: یحیی ابن ابی منصور), also called Bizist, son of Firuzan (Persian: بزیست فیروزان; d. 830) was a senior Persian official from the Banu al-Munajjim family, who served as an astronomer and an astrologer at the court of Abbasid caliph al-Ma'mun. Since his father Abu Mansur Aban was an astrologer in service of caliph al-Mansur, it can be concluded that Yahya spent his childhood in Baghdad.

Key takeaways

Yahya ibn Abi Mansur belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Yahya ibn Abi Mansur to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Yahya ibn Abi Mansur from memory before moving on to harder problems.

Reference excerpt

Yahya ibn Abi Mansur (Arabic: یحیی ابن ابی منصور), also called Bizist, son of Firuzan (Persian: بزیست فیروزان; d. 830) was a senior Persian official from the Banu al-Munajjim family, who served as an astronomer and an astrologer at the court of Abbasid caliph al-Ma'mun. Since his father Abu Mansur Aban was an astrologer in service of caliph al-Mansur, it can be concluded that Yahya spent his childhood in Baghdad. Yahya ibn Abi Mansur's first known position was as an astrologer for al-Fadl ibn Sahl, vizier of the caliph al-Ma'mun. After the assassination of al-Fadl, Yahya converted to Islam and adopted his Arabic name. He is associated with the House of Wisdom, and is mentioned as a teacher of the Banu Musa. He died near Aleppo in 830.

References

Sources Van Dalen, Benno (2007). "Yaḥyā ibn Abī Manṣūr: Abū ʿAlī Yaḥyā ibn Abī Manṣūr al‐Munajjim". In Hockey, Thomas; et al. (eds.). Biographical Encyclopedia of Astronomers. Springer. pp. 1249–1250. doi:10.1007/978-0-387-30400-7_1433. ISBN 978-1-4419-9918-4. (PDF version)

Further reading Karamati, Younes; Umar, Suheyl (2013). "Banū al-Munajjim". " Encyclopaedia Islamica. Leiden and New York: BRILL. ISBN 9789004246911. Pingree, D. "Banū Monajjem". Encyclopaedia Iranica. Columbia University. Retrieved 14 February 2014. Vernet, J (1970–80). "Yaḥyā ibn Abī Manṣūr". Dictionary of Scientific Biography. New York: Charles Scribner's Sons. ISBN 0-684-10114-9.

Worked examples

Example 1 — a first encounter with Yahya ibn Abi Mansur

Start with the simplest possible case. Write down what Yahya ibn Abi Mansur claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Yahya ibn Abi Mansur before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Yahya ibn Abi Mansur ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Yahya ibn Abi Mansur

In research: Yahya ibn Abi Mansur appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Yahya ibn Abi Mansur in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Yahya ibn Abi Mansur is common in secondary-school and first-year university syllabi. It links to neighbouring topics 830 deaths, 9th-century Iranian astronomers, 9th-century astrologers, so understanding it makes those chapters shorter.
In everyday life: Look for Yahya ibn Abi Mansur outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Yahya ibn Abi Mansur in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Yahya ibn Abi Mansur means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Yahya ibn Abi Mansur out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Yahya ibn Abi Mansur in simple terms?

Why does Yahya ibn Abi Mansur matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Yahya ibn Abi Mansur?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Yahya ibn Abi Mansur.