astronomy

João da Silva Feijó

João da Silva Feijó 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 João da Silva Feijó rather than just read about it. In short: João da Silva Barbosa or João da Silva Feijó, (1760 in Rio de Janeiro – 1824), was a naturalist, mineralogist and Portuguese soldier, born in Brazil. João da Silva Feijó studied philosophy and mathematics at the University of Coimbra and adopted the name Feijó in homage to Benito Jerónimo Feijoo, Spanish philosopher, who at the time was respected among natural history students.

Key takeaways

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

Reference excerpt

João da Silva Barbosa or João da Silva Feijó, (1760 in Rio de Janeiro – 1824), was a naturalist, mineralogist and Portuguese soldier, born in Brazil. João da Silva Feijó studied philosophy and mathematics at the University of Coimbra and adopted the name Feijó in homage to Benito Jerónimo Feijoo, Spanish philosopher, who at the time was respected among natural history students. In 1778, the Italian professor, Domenico Agostino Vandelli, was part of a group that founded the Natural History Museum in Lisbon. João da Silva was part of this group with Alexandre Rodrigues Ferreira, Manuel da Silva Galvão and Joaquim José da Silva. The feijoa, a tree that bears green fruits similar to guavas, is named after him.

Cape Verde Beginning in 1783, scientific voyages under Vandelli were launched. Naturalists were to plan expeditions to various colonies. Feijó arranged to explore the islands of the archipelago of Cape Verde, and arrived there in June 1783. Like his colleagues, he had great difficulty in pursuing his research as an independent man of science. The activities of a young naturalist, who observes and collects objects such as butterflies, plants, shells and minerals, are often regarded with contempt by colonial officials. He described his exploration of Cape Verde in seven letters sent to the minister Martinho de Mello e Castro and discusses the geography, topography and flora of the island. The work of Feijó disappointed his sponsor Mello e Castro, who criticized the packaging of shipments and paucity of material sent. It was regretted that Feijó has not proposed any method of exploiting the saltpetre and sulphur which was believed to be readily available in the volcanic regions of Cape Verde. In 1790, Feijó joined the local military establishment and soon requested that he be allowed to return to Portugal. In Lisbon, Feijó collaborated with his old friend Alexandre Rodrigues Ferreira, newly returned from the Amazon, to produce herbarium specimens from the Cape Verde material. The German naturalist Heinrich Friedrich Link, visiting Portugal between 1797 and 1799, met his Brazilian colleagues and praised their work. In 1797, Feijó rewrote some of the text relating to Cape Verde and published a work titled "Itinéraire philosophique".

External links Maria Estela Guedes et Luís M. Arruda, Feijó, naturaliste brésilien, au Cap-Vert au XVIIIe siècle Archived 2018-10-30 at the Wayback Machine João da Silva Feijó Voyages et expéditions

Worked examples

Example 1 — a first encounter with João da Silva Feijó

Start with the simplest possible case. Write down what João da Silva Feijó 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 João da Silva Feijó 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 João da Silva Feijó 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 João da Silva Feijó

In research: João da Silva Feijó 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 João da Silva Feijó 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: João da Silva Feijó is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1760 births, 1824 deaths, Mineralogists, so understanding it makes those chapters shorter.
In everyday life: Look for João da Silva Feijó 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 João da Silva Feijó in 20 minutes

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

Frequently asked questions

What is João da Silva Feijó in simple terms?

Why does João da Silva Feijó 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 João da Silva Feijó?

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 João da Silva Feijó.