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astronomy

Johan Reinhardt

Johan Reinhardt 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 Johan Reinhardt rather than just read about it. In short: Johannes Christopher Hagemann Reinhardt (23 December 1778 – 31 October 1845), sometimes called J. C.

Johan Reinhardt — main illustration
Johan Reinhardt — illustration

Key takeaways

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

Reference excerpt

Johannes Christopher Hagemann Reinhardt (23 December 1778 – 31 October 1845), sometimes called J. C. H. Reinhardt, was a professor in zoology at the University of Copenhagen.

Biography Born in Rendalen parish in Norway, his father, Johannes Henrik Reinhardt, was a priest, and his mother, Johanne Elisabeth Mommesen, was from Holmestrand. He was not baptized Johannes, but adopted the name later. After having been educated at home, he came to Copenhagen in 1792 and entered the university in 1793, where he passed the first two examinations, but after that spent almost two years at home, where he used the opportunity to study plants and animals. In 1796, he returned to Copenhagen to study theology, but his tendencies pulled him away from this study and towards natural history. He became a disciple of Martin Vahl, with whose help Reinhardt in 1801 got the opportunity to travel abroad, where he stayed until 1806 (in the beginning a mentor for a son of the titular councillor of state J.C.C. Brun). At first, Reinhardt studied mineralogy at the academy of mining in Freiberg, later primarily zoology and anatomy in Göttingen and finally in Paris. During his stay there he received an appointment as an inspector for that part of the newly established Royal Museum for Natural History which was founded by acquiring the collections of the Society for Natural History in 1805. He was just about to start as a private tutor in a German family in Normandy, but accepted happily the post as inspector instead, although the annual salary was only 200 Rdl., because he now felt it possible to return home without having to choose between "death from hunger or practising law". He remained in Paris for a few months more and tried to extend his rather insufficient knowledge by studying in the museums and by following Georges Cuvier's lectures, that had excited his enthusiasm. In late 1806 he returned and immediately took over the management of the collection. In 1809 he started giving lectures in the museum, and when professor J. Rathke had been transferred to Christiania, Reinhardt was also employed by the university in 1813, at first as a senior lecturer and the year after as a professor extraordinarius in natural history. In 1821, he became a member of the Royal Danish Academy of Sciences and Letters, in 1830 ordinary professor and a member of the Academic Council; in 1836 he was appointed honourable Doctor of Philosophy, and in 1839 he became titular councillor of state.

Personal life In 1814, he married Mette Margrethe Nicoline Hammeleff (1782–1832), a daughter of titular councillor of state N. Hammeleff and Juliane Marie Hammeleff, born Pontoppidan. His son, herpetologist Johannes Theodor Reinhardt, published Bidrag til Kundskab om Brasiliens Padder og Krybdyr alongside Christian Frederik Lütken, which contributed to knowledge of Brazilian amphibians and reptiles. Reinhardt died on 31 October 1845 in Copenhagen.

Taxon described by him See Category:Taxa named by Johan Reinhardt

References

Illustrations

Johan Reinhardt: The tomb of Johannes Reinhardt at Assistens Kirkegård, Copenhagen
The tomb of Johannes Reinhardt at Assistens Kirkegård, Copenhagen

Worked examples

Example 1 — a first encounter with Johan Reinhardt

Start with the simplest possible case. Write down what Johan Reinhardt 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 Johan Reinhardt 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 Johan Reinhardt 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 Johan Reinhardt

In research
Johan Reinhardt 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 Johan Reinhardt 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
Johan Reinhardt is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1776 births, 1845 deaths, Danish zoologists, so understanding it makes those chapters shorter.
In everyday life
Look for Johan Reinhardt 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 Johan Reinhardt in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Johan Reinhardt means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Johan Reinhardt out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Johan Reinhardt in simple terms?

Johannes Christopher Hagemann Reinhardt (23 December 1778 – 31 October 1845), sometimes called J. C.

Why does Johan Reinhardt 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 Johan Reinhardt?

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 Johan Reinhardt.

Tags

  • 1776 births
  • 1845 deaths
  • Danish zoologists
  • Members of the Royal Danish Academy of Sciences and Letters
  • People from Rendalen Municipality
  • Scientists from Copenhagen
  • University of Copenhagen alumni

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