astronomy

Ginrei

Ginrei 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 Ginrei rather than just read about it. In short: Ginrei or ShindaiSat was a 400x400x450mm cube-like microsatellite intended to text experimental visible light communication. The satellite is made in Shinshu University (Japan).

Key takeaways

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

Reference excerpt

Ginrei or ShindaiSat was a 400x400x450mm cube-like microsatellite intended to text experimental visible light communication. The satellite is made in Shinshu University (Japan). The ground station was completed by 18 March 2014 and attempts to communicate with satellite have started the same day. 2-way optical communication with ground station is planned. Also, advanced attitude control using visible light communication is planned as well.

Mission results The Ginrei optical signals were received 10 seconds per pass, averaged over 56 passes over the control station. The narrow beam and infrequent operation of optical transmitter have resulted in severe disappointment in amateur optical tracking community.

Worked examples

Example 1 — a first encounter with Ginrei

Start with the simplest possible case. Write down what Ginrei 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 Ginrei 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 Ginrei 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 Ginrei

In research: Ginrei 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 Ginrei 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: Ginrei is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2014 in Japan, Asian spacecraft stubs, Communications satellites of Japan, so understanding it makes those chapters shorter.
In everyday life: Look for Ginrei 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 Ginrei in 20 minutes

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

Frequently asked questions

What is Ginrei in simple terms?

Ginrei or ShindaiSat was a 400x400x450mm cube-like microsatellite intended to text experimental visible light communication. The satellite is made in Shinshu University (Japan).

Why does Ginrei 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 Ginrei?

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 Ginrei.