astronomy

Lyon astronomical clock

Lyon astronomical clock 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 astronomical clock rather than just read about it. In short: The Lyon astronomical clock (French: Horloge astronomique de Lyon) is a seventeenth-century astronomical clock in Lyon Cathedral. History and description The 9 m (30 ft) tall clock is installed in the cathedral of Lyon.

Key takeaways

Lyon astronomical clock 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 astronomical clock to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lyon astronomical clock from memory before moving on to harder problems.

Reference excerpt

The Lyon astronomical clock (French: Horloge astronomique de Lyon) is a seventeenth-century astronomical clock in Lyon Cathedral.

History and description The 9 m (30 ft) tall clock is installed in the cathedral of Lyon. An astrolabe indicates the date and position of the Moon, Sun, and Earth, as well as the stars. The first documentary evidence of an astronomical clock in the cathedral is from 1383 but this was destroyed in 1562. In 1661 it was reconstructed by Guillaume Nourrisson. During the French Revolution, all royal insignia was removed. The last restoration in 1954 reset the clock's perpetual calendar of 66 years. It will be accurate until 2019. The central tower octagon supports several automated figures. After the angel on the left turns the hourglass, an angel on the right keeps the time for the three angels who strike bells to sound the hymn of Saint Jean-Baptiste. The Virgin Mary kneels in a chapel, and turns to the Angel Gabriel as he opens the chapel door, while a dove descends, representing the Holy Spirit. A Swiss Guard rotates around the dome. Movement stops at the sounding of the hour. In a western niche, a statue rotates at midnight. On Sunday, it is Jesus resurrected; Monday: his death; Tuesday: St. John the Baptist; Wednesday: St. Stephen (patron saint of the ancient basilica) holding the palm of martyrs; Thursday: a child with chalice and host; Friday: a child with the symbols of crucifixion; on Saturday: the Virgin Mary. The clock was vandalized by an Iranian man in 2013, who claimed that "the magnificence of the clock prevented the faithful from concentrating on prayer." It is currently being repaired and is scheduled to begin operation again some time in 2024.

References

External links Atlas Obscura

Worked examples

Example 1 — a first encounter with Lyon astronomical clock

Start with the simplest possible case. Write down what Lyon astronomical clock 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 astronomical clock 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 astronomical clock 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 astronomical clock

In research: Lyon astronomical clock 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 astronomical clock 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 astronomical clock is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical clocks in France, Buildings and structures in Lyon, Vandalized works of art, so understanding it makes those chapters shorter.
In everyday life: Look for Lyon astronomical clock 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 astronomical clock in 20 minutes

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

Frequently asked questions

What is Lyon astronomical clock in simple terms?

The Lyon astronomical clock (French: Horloge astronomique de Lyon) is a seventeenth-century astronomical clock in Lyon Cathedral. History and description The 9 m (30 ft) tall clock is installed in the cathedral of Lyon.

Why does Lyon astronomical clock 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 astronomical clock?

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 astronomical clock.