astronomy

Heinrich Riikoja

Heinrich Riikoja 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 Heinrich Riikoja rather than just read about it. In short: Heinrich Roman Riikoja (until 1924 Reichenbach; 8 March 1891 Rakke – 31 October 1988 Tartu) was an Estonian zoologist and hydrobiologist. From 1910 to 1918, he studied at the University of Tartu, initially chemistry and later natural sciences.

Key takeaways

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

Reference excerpt

Heinrich Roman Riikoja (until 1924 Reichenbach; 8 March 1891 Rakke – 31 October 1988 Tartu) was an Estonian zoologist and hydrobiologist. From 1910 to 1918, he studied at the University of Tartu, initially chemistry and later natural sciences. He participated in the Estonian War of Independence. From 1919 to 1958 he taught at the University of Tartu. From 1920 onward, he directed investigations of Estonian inland bodies of water. He is known as the founder of Estonian hydrobiology. Among other things, he compiled a list of Estonian lakes and a list of Estonian fishes. In 1940 he was the rector of the University of Tartu. From 1922 to 1943, he was the representative of Estonia to International Society of Limnology. Awards:

1945: Estonian SSR merited scientist 1977: Estonian SSR state prize

Works Zooloogia praktikum keskkoolidele (1921) Selgrootute loomade süstemaatiline nimestik (1923, with Johannes Voldemar Veski) Kodumaa kalad (1927) Eestikeelseid zooloogilisi oskussõnu (1930, with Johannes Voldemar Veski) Tamula ja Vagula järv (1932–33) Aegviidu ümbruse järvedest (1935–36) Eesti järvede nimestik (1934, with Jaan Port and others) Eesti NSV kalad (1950)

References

Illustrations

Heinrich Riikoja: Heinrich Riikoja — Heinrich Riikoja

Worked examples

Example 1 — a first encounter with Heinrich Riikoja

Start with the simplest possible case. Write down what Heinrich Riikoja 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 Heinrich Riikoja 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 Heinrich Riikoja 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 Heinrich Riikoja

In research: Heinrich Riikoja 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 Heinrich Riikoja 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: Heinrich Riikoja is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1891 births, 1988 deaths, Academic staff of the University of Tartu, so understanding it makes those chapters shorter.
In everyday life: Look for Heinrich Riikoja 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 Heinrich Riikoja in 20 minutes

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

Frequently asked questions

What is Heinrich Riikoja in simple terms?

Why does Heinrich Riikoja 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 Heinrich Riikoja?

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 Heinrich Riikoja.