astronomy

Jaghmini

Jaghmini 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 Jaghmini rather than just read about it. In short: Mahmūd ibn Muḥammad ibn Umar al-Jaghmini (Arabic: محمود بن محمد بن عمر الجغميني) or 'al-Chaghmīnī', or al-Jaghmini, was a 13th or 14th-century Arab physician, astronomer and author of the Qanunshah (The Canon of Medicine) a short epitome of by Avicenna in Persian, and Mulakhkhas (Summary), a work on astronomy. Little of him is known beyond what is indicated by his name, that he was a native of Jaghmin, a village in…

Key takeaways

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

Reference excerpt

Mahmūd ibn Muḥammad ibn Umar al-Jaghmini (Arabic: محمود بن محمد بن عمر الجغميني) or 'al-Chaghmīnī', or al-Jaghmini, was a 13th or 14th-century Arab physician, astronomer and author of the Qanunshah (The Canon of Medicine) a short epitome of by Avicenna in Persian, and Mulakhkhas (Summary), a work on astronomy. Little of him is known beyond what is indicated by his name, that he was a native of Jaghmin, a village in Khwarezm (Khiva), current day Uzbekistan. He is sometimes confused with another Jaghmini who lived until the mid-14th century, but multiple sources show he was alive in the early 13th.

Qanunche The popularity of the Qanunshah may be indicated by the number of scholarly commentaries it produced. Two were by contemporaries of his, the scientists Ghazī Zade Rūmi and Mīr Seyed Sharīf Gorganī. Several versified versions were also produced and considerable evidence exists of its use in medical teaching in the eastern provinces of the Islamic world.

Mulakhkhas

The al-Mulakhkhas fi al-Hay'ah ("Epitome of plain theoretical astronomy") is an astronomical textbook describing the celestial orbs, the Earth, and their relations. It is simplified compared to other astronomical texts from the same period, in that it lacks proofs and does not discuss the distances or sizes of celestial objects. Written in the early 13th century, it started an educational tradition that lasted until the 18th. Many commentaries were written in Arabic and Persian and both commentators and copyists updated or corrected the information as time went on. A commentary written in 1412 by the mathematician Qāḍī Zāda al-Rūmī became, in turn, the subject of numerous super-commentaries. The celebrated Ottoman-Turkish historian Haji Khalifa, in his biographic account contained in Sullam al-Wusūl, mentions reading al-Jaghmini's Mulakhas, together with another astronomical work, Ashkal al-ta'sis by Shams al-Din Muhammad ibn Ashraf al-Samarqandi, with his tutor A'rej Mustafa Efendi, between the years 1643-45 AD.

Notes

References

Sources Kâtip Çelebi (1957). Balance of Truth. Translated by G.L. Lewis. London: George Allen & Unwin Ltd. pp. 141, 154.

Bibliography For a discussion of his popular epitome, the Qanuncheh, and the use made of it by subsequent generations of medical students, see:

A. Z. Iskandar, A Catalogue of Arabic Manuscripts on Medicine and Science in the Wellcome Historical Medical Library (London: The Wellcome Historical Medical Library, 1967), pp. 56–64. C.A. Storey, Persian Literature: A Bio-Bibliographical Survey. Volume II, Part 1: A. Mathematics, B. Weights and Measures, C. Astronomy and Astrology, D. Geography (London: Luzac, 1958), p. 219. Carl Brockelmann, Geschichte der arabischen Litteratur, 1st edition, 2 vols. (Leiden: Brill, 1889-1936). Second edition, 2 vols. (Leiden: Brill, 1943–49). Page references will be to those of the first edition, with the 2nd edition page numbers given in parentheses, p. 473 (625) Carl Brockelmann, Geschichte der arabischen Litteratur, Supplement, 3 vols. (Leiden: Brill, 1937-1942). vol. 1, p. 865. Manfred Ullmann, Die Medizin im Islam, Handbuch der Orientalistik, Abteilung I, Ergänzungsband vi, Abschnitt 1 (Leiden: E.J. Brill, 1970), p. 154 note 4. Lutz Richter-Bernburg, Persian Medical Manuscripts at the University of California, Los Angeles: A Descriptive Catalogue, Humana Civilitas, vol. 4 (Malibu: Udena Publications, 1978), p. 28. C.A. Storey, Persian Literature: A Bio-Bibliographical Survey. Volume II, Part 1: A. Mathematics, B. Weights and Measures, C. Astronomy and Astrology, D. Geography (London: Luzac, 1958), p. 50 no. 88.

Illustrations

Worked examples

Example 1 — a first encounter with Jaghmini

Start with the simplest possible case. Write down what Jaghmini 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 Jaghmini 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 Jaghmini 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 Jaghmini

In research: Jaghmini 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 Jaghmini 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: Jaghmini is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1344 deaths, 14th-century Persian-language writers, 14th-century astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Jaghmini 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 Jaghmini in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Jaghmini 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 Jaghmini out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jaghmini in simple terms?

Why does Jaghmini 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 Jaghmini?

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 Jaghmini.