science

Kōreisai

Kōreisai 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 Kōreisai rather than just read about it. In short: Kōreisai (皇霊祭), or Shun-ki (春季; Vernal) and Shū-ki (秋季; Autumnal) Kōreisai, are days of worship in Japan that began in 1878 ( Meiji 11 ) to pay respects to the past emperors and imperial family members. It occurred on the March equinox (spring equinox) and the September equinox (autumn equinox) of the anniversary of the person's death.

Key takeaways

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

Reference excerpt

Kōreisai (皇霊祭), or Shun-ki (春季; Vernal) and Shū-ki (秋季; Autumnal) Kōreisai, are days of worship in Japan that began in 1878 ( Meiji 11 ) to pay respects to the past emperors and imperial family members. It occurred on the March equinox (spring equinox) and the September equinox (autumn equinox) of the anniversary of the person's death. After the 1948 passing of the Act on National Holidays, these days were marked in a non-religious manner as the national holidays of Vernal Equinox Day and Autumnal Equinox Day. During the event, one prayed for good harvest in the spring and said thank you for the harvest in autumn. The equinoxes were also the days of ancestor veneration in China.

Worked examples

Example 1 — a first encounter with Kōreisai

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

In research: Kōreisai 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 Kōreisai 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: Kōreisai is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1878 establishments in Japan, Autumn equinox, Japanese Imperial Rituals, so understanding it makes those chapters shorter.
In everyday life: Look for Kōreisai 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 Kōreisai in 20 minutes

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

Frequently asked questions

What is Kōreisai in simple terms?

Why does Kōreisai 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 Kōreisai?

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 Kōreisai.