science

Gyldén (crater)

Gyldén (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 Gyldén (crater) rather than just read about it. In short: Gyldén is the remnant of a lunar impact crater that is located to the northeast of the walled plain Ptolemaeus on the Moon. Its diameter is 48 km.

Key takeaways

Gyldén (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 Gyldén (crater) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gyldén (crater) from memory before moving on to harder problems.

Reference excerpt

Gyldén is the remnant of a lunar impact crater that is located to the northeast of the walled plain Ptolemaeus on the Moon. Its diameter is 48 km. It is named after the Finland-Swedish astronomer Hugo Gyldén. It lies along the prime meridian of the selenographic coordinate system, and less than 150 km south of the lunar equator. Nearby craters of note include Herschel to the west, the flooded Réaumur to the north, and Hipparchus to the east.

The heart-shaped rim of this crater is in poor condition, having been eroded by impacts until the disintegrating remnants form an uneven ring of peaks and valleys around the interior floor. The satellite crater Réaumur A is attached to the northern rim. A wide cleft cuts through the western rim, continuing to the north-northwest past Spörer. The interior floor is relatively featureless, although the small crater Gyldén K is located just to the southeast of the midpoint.

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 Gyldén.

Illustrations

Gyldén (crater): Gyldén crater and its satellite craters taken from Earth in 2012 at the University of Hertfordshire's Bayfordbury Observatory with the telescopes Meade LX200 14" and Lumenera Skynyx 2-1 — Gyldén crater and its satellite craters taken from Earth in 2012 at the University of Hertfordshire's Bayfordbury Observatory with the telescopes Meade LX200 14" and Lumenera Skynyx 2-1

Worked examples

Example 1 — a first encounter with Gyldén (crater)

Start with the simplest possible case. Write down what Gyldén (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 Gyldén (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 Gyldén (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 Gyldén (crater)

In research: Gyldén (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 Gyldén (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: Gyldén (crater) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Impact craters on the Moon, LQ20 quadrangle, so understanding it makes those chapters shorter.
In everyday life: Look for Gyldén (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 Gyldén (crater) in 20 minutes

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

Frequently asked questions

What is Gyldén (crater) in simple terms?

Gyldén is the remnant of a lunar impact crater that is located to the northeast of the walled plain Ptolemaeus on the Moon. Its diameter is 48 km.

Why does Gyldén (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 Gyldén (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 Gyldén (crater).