science

Perrine (crater)

Perrine (crater) is a science 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 Perrine (crater) rather than just read about it. In short: Perrine is a lunar impact crater that is located on the northern hemisphere on the far side of the Moon. It lies to the west of the large walled plain named Landau, and to the northeast of the crater Charlier.

Key takeaways

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

Reference excerpt

Perrine is a lunar impact crater that is located on the northern hemisphere on the far side of the Moon. It lies to the west of the large walled plain named Landau, and to the northeast of the crater Charlier. To the north-northwest is the smaller Gullstrand. This is an unusual formation that forms part of a chain of connected craters. The western two-thirds of Perrine is overlain by the slightly smaller Perrine S, so that Perrine is crescent-shaped. The western rim of Perrine S is overlain by the still-smaller Perrine T. Perrine S has a worn outer rim, and a small central peak in the middle of the floor. The surviving rim of Perrine is worn and eroded, with the overlapping pair Perrine E and Perrine G intruding slightly into the eastern rim. A smaller crater has disrupted the southwest end of the outer rim, and a pair of small craters are attached to the northern rim. Only a small portion of the interior floor of Perrine still survives, forming a crescent-shaped surface between the outer rampart of Perrine S and the inner wall of Perrine. It is marked by a pair of tiny craterlets in the northern half. The crater was formally named by the IAU in 1970, after Charles D. Perrine. The satellite craters Perrine G and Perrine S were called Crater 94 and Crater 91, respectively.

Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Perrine.

References

Sources

Illustrations

Worked examples

Example 1 — a first encounter with Perrine (crater)

Start with the simplest possible case. Write down what Perrine (crater) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Perrine (crater) 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 Perrine (crater) 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 Perrine (crater)

In research: Perrine (crater) appears in science 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 Perrine (crater) 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: Perrine (crater) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Impact craters on the Moon, LQ02 quadrangle, so understanding it makes those chapters shorter.
In everyday life: Look for Perrine (crater) 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 Perrine (crater) in 20 minutes

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

Frequently asked questions

What is Perrine (crater) in simple terms?

Why does Perrine (crater) matter?

Because it connects several science 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 Perrine (crater)?

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 Perrine (crater).