astronomy

Lyon Observatory

Lyon Observatory 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 Lyon Observatory rather than just read about it. In short: Lyon Observatory is an astronomical observatory located in Saint-Genis-Laval, a commune in the Rhône department in eastern France, near Lyon. Founded in 1878, the entire facility was listed as a historical site on 9 May 2007.

Key takeaways

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

Reference excerpt

Lyon Observatory is an astronomical observatory located in Saint-Genis-Laval, a commune in the Rhône department in eastern France, near Lyon. Founded in 1878, the entire facility was listed as a historical site on 9 May 2007. In 1867, Paris astronomer Charles André requested of the prefect of Rhone, that a new observatory be created. In 1873, a commission offered to establish a facility in Sainte-Foy-lès-Lyon. André sought to have the site built in Saint-Genis-Laval. On March 11, 1878, Patrice de MacMahon approved the creation of the Lyon Observatory. André was appointed its first director.

Research Lyon Observatory has worked on polychromatic artificial stars for adaptive optics systems, made by a laser.

Directors 1878-1912: Charles André (1842-1912) 1912-1933: Jean Mascart (1872-1935) 1933-1966 : Jean Dufay (1896-1967) 1966-1976: Joseph-Henri Bigay (1910-1982) 1976-1986: Guy Monnet (1941-) 1986-1995: Jean-Claude Ribes (1940-) 1995-2005: Roland Bacon (1956-) 2005-2015: Bruno Guiderdoni 2015-... : Isabelle Daniel

See also List of astronomical observatories

References

External links

Official website Publications of Lyon Observatory digitalized on Paris Observatory digital library

Illustrations

Worked examples

Example 1 — a first encounter with Lyon Observatory

Start with the simplest possible case. Write down what Lyon Observatory 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 Lyon Observatory 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 Lyon Observatory 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 Lyon Observatory

In research: Lyon Observatory 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 Lyon Observatory 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: Lyon Observatory is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1878 establishments in France, Astronomical observatories in France, Astronomical observatory stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Lyon Observatory 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 Lyon Observatory in 20 minutes

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

Frequently asked questions

What is Lyon Observatory in simple terms?

Why does Lyon Observatory 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 Lyon Observatory?

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 Lyon Observatory.