astronomy

Victor Hensen

Victor Hensen 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 Victor Hensen rather than just read about it. In short: Christian Andreas Victor Hensen (10 February 1835 – 5 April 1924) was a German zoologist and marine biologist (planktology). He coined the term plankton and laid the foundation for biological oceanography and quantitative studies.

Key takeaways

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

Reference excerpt

Christian Andreas Victor Hensen (10 February 1835 – 5 April 1924) was a German zoologist and marine biologist (planktology). He coined the term plankton and laid the foundation for biological oceanography and quantitative studies.

Family Hensen was born in the town of Schleswig where his father ran a school for the deaf and dumb. His mother Henriette Caroline Amalie was the daughter of physician Carl Ferdinand Suadicani who founded an asylum in Schleswig. Hensen had eight sisters and five brothers including from his father's first marriage.

Education and work Hensen went to school in Schleswig from 1845 to 1859 and then joined a grammar school in Glückstadt (Holstein) after which he joined to study medicine at the universities of Würzburg, Berlin (studying under Müller) and Kiel. In 1859, he received his doctorate in Kiel for a thesis on epilepsy and urinary secretions. He worked for a while at Kiel and in 1859 he became a lecturer in anatomy and histology. He became an associate professor in 1864, succeeding Peter Ludwig Panum. In 1867, he became a member of the Prussian House of Representatives to push towards studies of the ocean. Upon his initiative, the Royal Prussian Commission for the Exploration of the Oceans was founded. Hensen's students included Paul Höber, Hans Winterstein, and Hans Piper. He became a professor of physiology in 1868 and worked at Kiel until 1891. During his time, he was head of five marine biological expeditions to the Baltic and North Seas, as well as the Atlantic Ocean. He led an expedition in 1889 on the steamboat National from Kiel to southern Greenland in the north to as far as near the mouth of the Amazon in Pará, Brazil in the south to study whether plankton can be found more in tropical waters than cold waters. Hensen also worked in embryology and anatomy examining the eye of cephalopods and the hearing organs of decapods. He discovered a structure in the ear, the Hensen duct, also known as the Canal of Hensen. He also discovered Hensen's cells, Hensen's stripe, and two structures essential for the development of birds, the Hensen's node and Hensen's line. Hensen was for several years dean of the Faculty of Medicine and several times was rector of the University of Kiel. He was honorary doctor of Kiel, a member of the Leopoldine Academy, and a corresponding member of the Bavarian and Prussian academies of science.

Family and legacy Hensen married Andrea Katharina Friederike Seestern-Pauly in 1870 and they had two sons and daughters. The RV VICTOR HENSEN is a research vessel named in his honor.

Works Zur Morphologie der Schnecke des Menschen und der Säugethiere (1863)

References

External links

Some text by Hensen (in German and English) Image of Hensen The vessel Victor Hensen (in German) Correspondence between Darwin and Hensen Archived 2007-04-26 at the Wayback Machine

Illustrations

Victor Hensen: Victor Hensen — Victor Hensen

Worked examples

Example 1 — a first encounter with Victor Hensen

Start with the simplest possible case. Write down what Victor Hensen 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 Victor Hensen 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 Victor Hensen 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 Victor Hensen

In research: Victor Hensen 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 Victor Hensen 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: Victor Hensen is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1835 births, 1924 deaths, Academic staff of the University of Kiel, so understanding it makes those chapters shorter.
In everyday life: Look for Victor Hensen 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 Victor Hensen in 20 minutes

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

Frequently asked questions

What is Victor Hensen in simple terms?

Why does Victor Hensen 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 Victor Hensen?

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 Victor Hensen.