astronomy

Nelly de Rooij

Nelly de Rooij 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 Nelly de Rooij rather than just read about it. In short: Petronella Johanna Nelly de Rooij (30 July 1883 – 10 June 1964) was a Dutch zoologist and herpetologist. Biography De Rooij was born in Weesp, and she studied medicine in Amsterdam until discrimination against her gender in Dutch law obliged her to continue her studies in Zurich.

Key takeaways

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

Reference excerpt

Petronella Johanna Nelly de Rooij (30 July 1883 – 10 June 1964) was a Dutch zoologist and herpetologist.

Biography De Rooij was born in Weesp, and she studied medicine in Amsterdam until discrimination against her gender in Dutch law obliged her to continue her studies in Zurich. She studied the cardiovascular system of salamanders of the genus Andrias, and she was awarded her Doctor of Philosophy by the University of Zurich in 1907. With her qualification she was able to return to Amsterdam where she became a curator at the museum of zoology within the University of Amsterdam. In 1922 she was obliged to leave due to administrative reforms, but in this short academic career she was able to publish The Reptiles of the Indo-Australian Archipelago. The book was based on reptile specimens that were sent to the museum from the Dutch East Indies. De Rooij died in Arnhem in 1964.

Legacy De Rooij had two reptile species named after her: Petronella's kukri snake (Oligodon petronellae) by Jean Roux in 1917 and De Rooij's skink (Sphenomorphus derooyae), originally named Lygosoma derooyae by Jan Komelis de Jong in 1927.

Taxa described by de Rooij Calamaria ceramensis, 1913 Calamaria lautensis, 1917 Cyrtodactylus malayanus, 1915 Cyrtodactylus sermowaiensis, 1915 Draco taeniopterus, 1915 Eugongylus unilineatus, 1915 Sphenomorphus longicaudatus, 1915 Sphenomorphus nigriventris, 1915 Stegonotus florensis, 1917 Tribolonotus gracilis, 1909

References

Worked examples

Example 1 — a first encounter with Nelly de Rooij

Start with the simplest possible case. Write down what Nelly de Rooij 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 Nelly de Rooij 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 Nelly de Rooij 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 Nelly de Rooij

In research: Nelly de Rooij 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 Nelly de Rooij 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: Nelly de Rooij is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1883 births, 1964 deaths, 20th-century Dutch women scientists, so understanding it makes those chapters shorter.
In everyday life: Look for Nelly de Rooij 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 Nelly de Rooij in 20 minutes

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

Frequently asked questions

What is Nelly de Rooij in simple terms?

Petronella Johanna Nelly de Rooij (30 July 1883 – 10 June 1964) was a Dutch zoologist and herpetologist. Biography De Rooij was born in Weesp, and she studied medicine in Amsterdam until discrimination against her gender in Dutch law obliged her to continue her studies in Zurich.

Why does Nelly de Rooij 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 Nelly de Rooij?

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 Nelly de Rooij.