science

Nakatsu Castle

Nakatsu Castle 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 Nakatsu Castle rather than just read about it. In short: Nakatsu Castle (中津城, Nakatsu-jō) is a Japanese castle in the city of Nakatsu in Ōita Prefecture. It is known as one of the three mizujiro, or "castles on the sea", in Japan, with Takamatsu Castle in Kagawa Prefecture and Imabari Castle in Ehime Prefecture.

Key takeaways

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

Reference excerpt

Nakatsu Castle (中津城, Nakatsu-jō) is a Japanese castle in the city of Nakatsu in Ōita Prefecture. It is known as one of the three mizujiro, or "castles on the sea", in Japan, with Takamatsu Castle in Kagawa Prefecture and Imabari Castle in Ehime Prefecture.

History

Construction began under the rule of Daimyō Kuroda Yoshitaka in 1587, when he was made the governor of the region by Toyotomi Hideyoshi for his help in the Kyūshū Campaign. Yoshitaka was rewarded with greater lands in Fukuoka after the Battle of Sekigahara and was replaced by Daimyō Hosokawa Tadaoki, who completed the construction. Tadaoki moved to Kokura Castle, when it was built, and Nakatsu castle was given to his son Hosokawa Tadatoshi. The castle was taken over by the Ogasawara clan and subsequently by the Okudaira Clan in 1717. It was abandoned in 1871 after the Meiji Restoration and the structure was destroyed in a fire during the Satsuma Rebellion in 1877. The present castle was built in 1964 by the descendants of the Okudaira samurai clan and was modeled on Hagi Castle.

Architecture The total area of the castle grounds is about 78,000 sq. m and the structure was built in the shape of an open fan. The castle is bordered by a traditional stone wall and a moat. The building is a steel-frame five-storied structure, and the top floor is an observation deck. The castle draws salt water from the nearby Seto Inland Sea to fill the moat.

Legacy

According to local folklore, Yoshitaka faced rebellions from the people of his region, who attacked his castle. The rebels were slain, but their bloodstains showed through the walls even after painting them over, prompting the governor to have the walls painted red. The original castle housed a small shrine for the rebel leader Utsonomiya Shigefusa.

Today The castle is presently used as a museum displaying heirlooms of families that governed the region. The museum has many materials on rangaku, as the city of Nakatsu was a center of rangaku learning. Furthermore, the castle houses the Okudaira shrine, which is an important shrine for the people of the city. The castle was put up for sale in 2007 by the owners. After negotiations with the Nakatsu City Council fell through, the building was sold in 2010 to a Saitama-based company called Chiga. The Castle was listed as one of the Continued Top 100 Japanese Castles in 2017.

References

Illustrations

Worked examples

Example 1 — a first encounter with Nakatsu Castle

Start with the simplest possible case. Write down what Nakatsu Castle 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 Nakatsu Castle 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 Nakatsu Castle 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 Nakatsu Castle

In research: Nakatsu Castle 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 Nakatsu Castle 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: Nakatsu Castle is common in secondary-school and first-year university syllabi. It links to neighbouring topics Castles in Ōita Prefecture, Kuroda clan, Ogasawara clan, so understanding it makes those chapters shorter.
In everyday life: Look for Nakatsu Castle 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 Nakatsu Castle in 20 minutes

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

Frequently asked questions

What is Nakatsu Castle in simple terms?

Why does Nakatsu Castle 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 Nakatsu Castle?

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 Nakatsu Castle.