ArticleslgStudy

astronomy

Nissim of Gerona

Nissim of Gerona 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 Nissim of Gerona rather than just read about it. In short: Nissim ben Reuven (1290 – 9th of Shevat, 1376, Hebrew: נִסִּים בֶּן רְאוּבֵן) of Girona, Catalonia was an influential talmudist and authority on Jewish law. He was one of the last of the great Spanish medieval Talmudic scholars.

Key takeaways

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

Reference excerpt

Nissim ben Reuven (1290 – 9th of Shevat, 1376, Hebrew: נִסִּים בֶּן רְאוּבֵן) of Girona, Catalonia was an influential talmudist and authority on Jewish law. He was one of the last of the great Spanish medieval Talmudic scholars. He is also known by his Hebrew acronym, the RaN (ר"ן), or else with the definite article HaRaN (הר"ן), as well as by the name RaNbaR (רנב"ר), the Hebrew acronym of his full name, including his father's name, Reuven (ראובן), and also by Nissim Gerondi.

Biography Nissim was born in Barcelona, Catalonia. He was a physician and had knowledge of astronomy. His teacher is not known; his works refer to a R. Perez as morenu ("our teacher"), but as he refers to his father (Reuben ben Nissim) as "my father and teacher" perhaps his father was his primary teacher. He served as a judge and teacher for the Jewish community in Barcelona, and founded a yeshiva there. He criticized the wealthy members of the community for their behavior, but this provoked a hostile backlash from them. He suffered at the hands of certain wealthy and powerful Jews of his community, who even slandered him and other leading rabbis before the government, and they were even imprisoned for a period of five months before their innocence was proven. When the Spanish Jews combined to send a petition to the king entreating his protection, Nissim was one of the committee who drafted the document. His closest students were the Isaac ben Sheshet and Hasdai Crescas.

Scholarship

Commentary on Alfasi His best-known work is his commentary and explanation of Isaac Alfasi's Sefer Ha-halachot, which had, at that time, been adopted for practical decisions. He is very detailed and explicit where the subject is important from a practical point of view, but extremely brief when dealing with theory. Ran did not write the commentary on all of Alfasi, although the whole commentary is often ascribed to him. In his comments he did not hesitate to refute the greatest earlier authorities, such as Rashi, Rabbenu Tam, Maimonides, Nachmanides, and Solomon ben Aderet. However, he showed his reverence for these teachers by adopting their opinions in practise. Frequently, he would refute the opinion of an earlier teacher but then write: "Yet since the ancients have decided thus, their conclusions may not be set aside." According to his student Isaac ben Sheshet, he was generally very cautious in his decisions and inclined toward conservatism. In his commentaries Nissim endeavored to establish the decisions relating to practise, and he devoted himself to the explanation and defense of Alfasi's "Halakot," since that compendium had been adopted for practical decisions. The extant commentaries of Nissim on the "Halakhot" cover the treatises Shabbat, Pesaḥim, Ta'anit, Rosh ha-Shanah, Beẓah, Sukkah, Megillah, Ketubot, Giṭṭin, Ḳiddushin, Shebu'ot, and Avodah Zarah. Commentaries on Mo'ed Katan and Makkot are erroneously ascribed to him. He is very detailed and explicit where the subject is important from a practical point of view, but extremely brief when dealing with matters of mere theory. The commentary is now printed with Alfasi in standard editions of the Talmud.

Commentary on the Talmud Nissim also wrote commentaries on the Talmud itself. A scholarly edition of the surviving commentaries has been published in recent years. In these works also Nissim sought to determine the practical decisions, and at the end of nearly every exposition and explanation of any length he summed up whatever was of importance for practical purposes. He was the first to write a complete commentary on the treatise Nedarim; and this part of his work is the most valuable portion of the collection, since this treatise was neglected in the geonic period, and the later glosses on it left much to be desired.

Responsa He was recognized as a rabbinical authority even beyond Spain, and rabbinical questions ("she'elot") were addressed to him not only from his own country, but also from France, Italy, Africa, and the Land of Israel. He wrote in reply about 1,000 responsa, of which only 77 have been preserved. These show his insight and his rationalistic method of treating halakhic material. His responsa were first published at Rome (1546), and were reprinted at Constantinople (1548) and, in an enlarged form, at Cremona (1557).

Other works He wrote a philosophical work containing twelve homilies ("derashot"), displaying in this small volume his familiarity with philosophy, especially with that of Maimonides and Ibn Ezra. He was "no friend of mysticism", and even reproved Nahmanides for devoting too much time to the Kabbalah. He also wrote a recently published commentary on the Bible, and a work of philosophy.

References

This article incorporates text from a publication now in the public domain: Singer, Isidore; et al., eds. (1901–1906). "NISSIM B. REUBEN GERONDI (RaN, ר"ן)". The Jewish Encyclopedia. New York: Funk & Wagnalls.

Worked examples

Example 1 — a first encounter with Nissim of Gerona

Start with the simplest possible case. Write down what Nissim of Gerona 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 Nissim of Gerona 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 Nissim of Gerona 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 Nissim of Gerona

In research
Nissim of Gerona 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 Nissim of Gerona 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
Nissim of Gerona is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1290 births, 1376 deaths, 14th-century Catalan rabbis, so understanding it makes those chapters shorter.
In everyday life
Look for Nissim of Gerona 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.
Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Nissim of Gerona” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Nissim of Gerona in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Nissim of Gerona means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Nissim of Gerona out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nissim of Gerona in simple terms?

Nissim ben Reuven (1290 – 9th of Shevat, 1376, Hebrew: נִסִּים בֶּן רְאוּבֵן) of Girona, Catalonia was an influential talmudist and authority on Jewish law. He was one of the last of the great Spanish medieval Talmudic scholars.

Why does Nissim of Gerona 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 Nissim of Gerona?

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 Nissim of Gerona.

Tags

  • 1290 births
  • 1376 deaths
  • 14th-century Catalan rabbis
  • 14th-century Jewish biblical scholars
  • 14th-century astronomers
  • 14th-century medical doctors
  • Authors of books on Jewish law
  • Bible commentators
  • Medieval Catalan astronomers
  • Medieval Jewish astronomers
  • Medieval Jewish medical doctors of Spain
  • Medieval Spanish medical doctors

Keep exploring