science

Jalal al-Din Yazdi

Jalal al-Din Yazdi is a science 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 Jalal al-Din Yazdi rather than just read about it. In short: Jalal al-Din Mohammad ibn Abdollah Yazdi (Persian: جلال‌الدین محمد بن عبدالله یزدی; died 1618), also known as Jalal al-Din Monajjem Yazdi (جلال‌الدین منجم یزدی), was a Safavid astrologer (monajjem) and chronicler of Persian origin. His chronicle, the Roozname-ye Molla Jalal (also referred to as Tarikh-e Abbasi), covers Safavid history from 1576 to 1611.

Key takeaways

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

Reference excerpt

Jalal al-Din Mohammad ibn Abdollah Yazdi (Persian: جلال‌الدین محمد بن عبدالله یزدی; died 1618), also known as Jalal al-Din Monajjem Yazdi (جلال‌الدین منجم یزدی), was a Safavid astrologer (monajjem) and chronicler of Persian origin. His chronicle, the Roozname-ye Molla Jalal (also referred to as Tarikh-e Abbasi), covers Safavid history from 1576 to 1611. It deals with a period spanning from the final year of the reign of Shah ("King") Tahmasp I (r. 1524–1576) to the penultimate decade of the reign of Shah Abbas the Great (also known as Abbas I; r. 1588–1629). Born at an unknown date, Yazdi's family originated from the city of Yazd. He wrote two other works in addition to the Roozname-ye Molla Jalal; the Tohfat al-monajjemin ("Gift for astrologers") and the Tohfeh-ye khani ("Gift for the Khan"). Two of Yazdi's son are known to have survived his death. One of his sons, Kamal, became court astrologer in the final years of the reign of Abbas I and continued to occupy this post until the reign of Shah Abbas II (r. 1642–1666).

Sources Calmard, Jean; Mossadegh, Ali-Asghar; Bastani Parizi, M. (1987). "Notes sur des historiographes de l'époque safavide". Studia Iranica (in French). 16 (1): 123–135. doi:10.2143/SI.16.1.2014620. Ghereghlou, Kioumars (2018). "Jalāl al-Dīn Yazdī". In Fleet, Kate; Krämer, Gudrun; Matringe, Denis; Nawas, John; Rowson, Everett (eds.). Encyclopaedia of Islam (3rd ed.). Brill Online. ISSN 1873-9830.

Illustrations

Worked examples

Example 1 — a first encounter with Jalal al-Din Yazdi

Start with the simplest possible case. Write down what Jalal al-Din Yazdi claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Jalal al-Din Yazdi 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 Jalal al-Din Yazdi 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 Jalal al-Din Yazdi

In research: Jalal al-Din Yazdi appears in science 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 Jalal al-Din Yazdi 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: Jalal al-Din Yazdi is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1618 deaths, 16th-century Iranian historians, 16th-century astrologers, so understanding it makes those chapters shorter.
In everyday life: Look for Jalal al-Din Yazdi 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 Jalal al-Din Yazdi in 20 minutes

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

Frequently asked questions

What is Jalal al-Din Yazdi in simple terms?

Why does Jalal al-Din Yazdi matter?

Because it connects several science 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 Jalal al-Din Yazdi?

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 Jalal al-Din Yazdi.