astronomy

Johannes Wilsing

Johannes Wilsing 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 Johannes Wilsing rather than just read about it. In short: Johannes Wilsing (8 September 1856 – 23 December 1943) was a German astronomer. He was born in Berlin, where he was educated in addition to Göttingen.

Key takeaways

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

Reference excerpt

Johannes Wilsing (8 September 1856 – 23 December 1943) was a German astronomer. He was born in Berlin, where he was educated in addition to Göttingen. In 1880 he was awarded his Ph.D. from Humboldt-Universität of Berlin with a dissertation titled, Über den Einfluss von Luftdruck und Wärme auf die Pendelbewegung (On the influence of air pressure and heat on the movement of a pendulum). In 1881 he joined the Astrophysical Observatory Potsdam (AOP) as an assistant, and would remain there until he retired. His early career was spent on solar studies, including observations of sunspots and derivations of the rotation period. In 1897 he measured the parallax of 61 Cygni, a relatively nearby star. He became an observer at the AOP in 1898, and the following year he collaborated with Julius Scheiner in an unsuccessful attempt to measure the radio emission from the Sun. The same year he attempted to interpret the spectrum of novae. He performed extensive work on the luminosity, colors, and diameters of stars. He retired in 1921 and died in Potsdam. The crater Wilsing on the Moon is named after him.

External links Johannes Wilsing Mathematics genealogy project

Worked examples

Example 1 — a first encounter with Johannes Wilsing

Start with the simplest possible case. Write down what Johannes Wilsing 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 Johannes Wilsing 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 Johannes Wilsing 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 Johannes Wilsing

In research: Johannes Wilsing 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 Johannes Wilsing 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: Johannes Wilsing is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1856 births, 1943 deaths, 19th-century German astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Johannes Wilsing 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 Johannes Wilsing in 20 minutes

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

Frequently asked questions

What is Johannes Wilsing in simple terms?

Johannes Wilsing (8 September 1856 – 23 December 1943) was a German astronomer. He was born in Berlin, where he was educated in addition to Göttingen.

Why does Johannes Wilsing 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 Johannes Wilsing?

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 Johannes Wilsing.