astronomy

William Ellis (astronomer)

William Ellis (astronomer) 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 William Ellis (astronomer) rather than just read about it. In short: Major William Ellis (20 February 1828 – 11 December 1916) was a British astronomer and meteorologist. He was born 20 February 1828, in Greenwich, United Kingdom, the son of Henry Ellis, an assistant at the Royal Observatory, Greenwich.

Key takeaways

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

Reference excerpt

Major William Ellis (20 February 1828 – 11 December 1916) was a British astronomer and meteorologist. He was born 20 February 1828, in Greenwich, United Kingdom, the son of Henry Ellis, an assistant at the Royal Observatory, Greenwich. In 1841 he began working at the Royal Observatory, first as a computer and later as an observer. In 1852 he took charge of Durham University Observatory, before returning the following year to the Royal Observatory, Greenwich where he first headed the Time Department and later the Magnetical and Meteorological Department. He was elected a Fellow of the Royal Astronomical Society in 1864, a Fellow of the Royal Meteorological Society in 1875, and a Fellow of the Royal Society in 1893. He served as president of the Royal Meteorological Society in 1886 and 1887. Ellis was also a member of the Eugenics Education Society. He succumbed to heart failure on 11 December 1916, at Blackheath, London.

References "Obituary: William Ellis, F.R.S." Nature. 98: 312–313. 21 December 1916. Bibcode:1916Natur..98..312W. doi:10.1038/098312b0. "Eugenics in Britain". Social Studies of Science. 6 (3/4): 499–532. 1976.

Worked examples

Example 1 — a first encounter with William Ellis (astronomer)

Start with the simplest possible case. Write down what William Ellis (astronomer) 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 William Ellis (astronomer) 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 William Ellis (astronomer) 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 William Ellis (astronomer)

In research: William Ellis (astronomer) 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 William Ellis (astronomer) 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: William Ellis (astronomer) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1828 births, 1916 deaths, 19th-century British astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for William Ellis (astronomer) 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 William Ellis (astronomer) in 20 minutes

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

Frequently asked questions

What is William Ellis (astronomer) in simple terms?

Why does William Ellis (astronomer) 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 William Ellis (astronomer)?

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 William Ellis (astronomer).