astronomy

Johann Georg Christian Lehmann

Johann Georg Christian Lehmann 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 Johann Georg Christian Lehmann rather than just read about it. In short: Johann Georg Christian Lehmann (25 February 1792 – 12 February 1860) was a German botanist. Born at Haselau, near Uetersen, Holstein, Lehmann studied medicine in Copenhagen and Göttingen, obtained a doctorate in medicine in 1813 and a doctorate in philosophy from the University of Jena in 1814.

Key takeaways

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

Reference excerpt

Johann Georg Christian Lehmann (25 February 1792 – 12 February 1860) was a German botanist. Born at Haselau, near Uetersen, Holstein, Lehmann studied medicine in Copenhagen and Göttingen, obtained a doctorate in medicine in 1813 and a doctorate in philosophy from the University of Jena in 1814. He spent the rest of his life as professor of physics and natural sciences, and head librarian, at the Gymnasium Academicum in Hamburg. A prolific monographist of apparently quarrelsome character, he was a member of 26 learned societies and the founder of the Hamburg Botanical Garden (Botanischer Garten Hamburg, now the Alter Botanischer Garten Hamburg). Lehmann died at Hamburg in 1860. Some of Lehmann's later illustrations were executed by the German entomologist Johann Wilhelm Meigen. Botanical specimens collected by Lehmann are cared for at institutions including the National Herbarium of Victoria (MEL), Royal Botanic Gardens Victoria.

Publications Generis Nicotiniarum Historia Hamburg 1818 Plantae e Familiae Asperifoliarum Nuciferae 1818 Monographia Generis Primularum Lipsiae 1819 Monographia Generis Potentillarum 1820 Supplement 1836 Semina in Horto Botanico Hamburgensi 1822-1840 Icones et Descriptiones Novarum et Minus Cognitarum Stirpium in 5 parts of 10 plates each 1: 1821 2: 1822 3: 1823 4: 1823 5: 1824 Novarum et Minus Cognitarum Stirpium Pugillus I-X Addita Enumeratione Plantarum Omnium in his Pugillus Descriptarum. Hamburgi 1828-1857 Delectus Seminum quae in Horto Hamburgensium Botanico e Collectioni Anni1830-1840; 1849–1852 Plantae Preissianae Hamburg 1844-1847 Index Seminum in Horto Botanico Hamburgensi A. 1851 Collectorum Hamburg 1851-1855 Revisionem Potentillarum 1856 Observationes zoologicae praesertim in faunam hamburgensem. Pugillus primus. Indicem scholarum publice privatimque in Hamburgensium Gymnasio Academico 1822

References

Brummitt, R. K.; Powell, C. E. (1992). Authors of Plant Names. Royal Botanic Gardens, Kew. ISBN 1-84246-085-4.

External links https://upload.wikimedia.org/wikipedia/commons/5/56/Johann_Christian_Lehmann.jpg Allg. Deutsche Biographie

Worked examples

Example 1 — a first encounter with Johann Georg Christian Lehmann

Start with the simplest possible case. Write down what Johann Georg Christian Lehmann 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 Johann Georg Christian Lehmann 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 Johann Georg Christian Lehmann 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 Johann Georg Christian Lehmann

In research: Johann Georg Christian Lehmann 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 Johann Georg Christian Lehmann 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: Johann Georg Christian Lehmann is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1792 births, 1860 deaths, 19th-century German botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Johann Georg Christian Lehmann 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 Johann Georg Christian Lehmann in 20 minutes

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

Frequently asked questions

What is Johann Georg Christian Lehmann in simple terms?

Why does Johann Georg Christian Lehmann 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 Johann Georg Christian Lehmann?

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 Johann Georg Christian Lehmann.