astronomy

Hans E. Lau

Hans E. Lau 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 Hans E. Lau rather than just read about it. In short: Hans-Emil Lau (16 April 1879 – 16 October 1918) was a Danish astronomer. He started his observational career during his studies at Copenhagen University.

Key takeaways

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

Reference excerpt

Hans-Emil Lau (16 April 1879 – 16 October 1918) was a Danish astronomer. He started his observational career during his studies at Copenhagen University. After completing his degree in 1906 he worked at the Urania, the Treptow Observatory at Berlin, and finally at Horsholm Observatory in Copenhagen. He is most famous for his work on Mars and Jupiter. He also worked on star parallax, the measuring of variable stars, the color of stars, and the observation of comets, sunspots, and the rings of Saturn. He published speculative orbits of two trans-Neptunian planets in 1900, which were never found. He died prematurely at the age of 39 during the worldwide 1918 flu pandemic. A crater on Mars was named in his honor.

External links

Obituaries AN 208 (1919) 151/152 (in German)

Worked examples

Example 1 — a first encounter with Hans E. Lau

Start with the simplest possible case. Write down what Hans E. Lau 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 Hans E. Lau 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 Hans E. Lau 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 Hans E. Lau

In research: Hans E. Lau 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 Hans E. Lau 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: Hans E. Lau is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1879 births, 1918 deaths, 20th-century Danish astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Hans E. Lau 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Hans E. Lau” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Hans E. Lau in 20 minutes

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

Frequently asked questions

What is Hans E. Lau in simple terms?

Hans-Emil Lau (16 April 1879 – 16 October 1918) was a Danish astronomer. He started his observational career during his studies at Copenhagen University.

Why does Hans E. Lau 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 Hans E. Lau?

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 Hans E. Lau.