astronomy

Jean Bosler

Jean Bosler 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 Jean Bosler rather than just read about it. In short: Jean Bosler (24 March 1878 in Angers – 25 September 1973 in Marseille) was a French astronomer and author of several books. Recruited by Deslandres as an astronomer at l’observatoire de Paris, Bosler discovered in 1908 in the spectrum of Comet Morehouse the spectral lines of ionized nitrogen, which was the first evidence of that element in comets.

Key takeaways

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

Reference excerpt

Jean Bosler (24 March 1878 in Angers – 25 September 1973 in Marseille) was a French astronomer and author of several books. Recruited by Deslandres as an astronomer at l’observatoire de Paris, Bosler discovered in 1908 in the spectrum of Comet Morehouse the spectral lines of ionized nitrogen, which was the first evidence of that element in comets. Much of his research was on the physical properties and orbits of comets. He made a report on progress in astrophysics in the United States for the 1910 annual report of the Smithsonian Institution. In 1912, he showed in his doctoral dissertation (supervised by Henri Poincaré) that the Sun's magnetic field, by means of the intermediary of the solar wind, explains many aspects of cometary tails, the aurora borealis and aurora australis, solar storms and telluric currents. During a solar eclipse in 1914, Bosler observed in the corona a spectral band “nouvelle, intense et unique” which he suggested was spectral evidence for coronium; however, in the 1930s subsequent research showed that the cause was a highly ionized form of iron. In 1916, he published an analysis of the circular form of lunar craters as caused by the impact of meteors. In 1923 Bosler was named director of Marseille Observatory, a post he occupied until his retirement in 1948. Simultaneously with his directorship, he taught at the University of Marseille from 1923 to 1948. Bosler made important contributions to the theory of the evolution of stars and published the first textbook in French that dealt with the then recent discoveries of Hubble and the work on optical phenomena of such physicists as Michelson, Fabry and Perot. Bosler won the Prix Jules Janssen in 1911 from the Société astronomique de France, the French astronomical society, and the Prix Lalande from l'Académie des sciences in 1913. He came from the French branch of the Hessian family Boßler. Books

Les théories modernes du soleil (1910) L’évolution des étoiles (1923) Cours d’astronomie (1928)

References

External links J. Bosler @ Astrophysics Data System

Illustrations

Worked examples

Example 1 — a first encounter with Jean Bosler

Start with the simplest possible case. Write down what Jean Bosler 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 Jean Bosler 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 Jean Bosler 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 Jean Bosler

In research: Jean Bosler 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 Jean Bosler 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: Jean Bosler is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1878 births, 1973 deaths, 20th-century French astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Jean Bosler 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 Jean Bosler in 20 minutes

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

Frequently asked questions

What is Jean Bosler in simple terms?

Why does Jean Bosler 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 Jean Bosler?

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 Jean Bosler.