astronomy

Piet Hartman

Piet Hartman 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 Piet Hartman rather than just read about it. In short: Piet Hartman (11 April 1922 – 26 March 2021) was a Dutch crystallographer, who worked as professor at Leiden University and Utrecht University between 1973 and 1987. Career Hartman was born in Veendam on 11 April 1922.

Key takeaways

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

Reference excerpt

Piet Hartman (11 April 1922 – 26 March 2021) was a Dutch crystallographer, who worked as professor at Leiden University and Utrecht University between 1973 and 1987.

Career Hartman was born in Veendam on 11 April 1922. He studied physical chemistry at the University of Groningen. Hartman subsequently obtained his title of doctor under professor P. Terpstra at the same university on 18 December 1953, with a dissertation titled: "Relations between structure and morphology of crystals". He became a lector of crystallography at Leiden University in 1959. In 1973 he was named full professor and he continued to work at Leiden University until 1980. In 1978 he was named professor of crystallography at Utrecht University, where he would work until his retirement in 1987. Hartman was elected a member of the Royal Netherlands Academy of Arts and Sciences in 1982. He died on 26 March 2021, shortly before his 99th birthday.

References

Worked examples

Example 1 — a first encounter with Piet Hartman

Start with the simplest possible case. Write down what Piet Hartman 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 Piet Hartman 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 Piet Hartman 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 Piet Hartman

In research: Piet Hartman 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 Piet Hartman 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: Piet Hartman is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1922 births, 2021 deaths, 20th-century Dutch scientists, so understanding it makes those chapters shorter.
In everyday life: Look for Piet Hartman 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 Piet Hartman in 20 minutes

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

Frequently asked questions

What is Piet Hartman in simple terms?

Piet Hartman (11 April 1922 – 26 March 2021) was a Dutch crystallographer, who worked as professor at Leiden University and Utrecht University between 1973 and 1987. Career Hartman was born in Veendam on 11 April 1922.

Why does Piet Hartman 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 Piet Hartman?

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 Piet Hartman.