astronomy

Manuel John Johnson

Manuel John Johnson 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 Manuel John Johnson rather than just read about it. In short: Manuel John Johnson, FRS (23 May 1805 – 28 February 1859) was a British astronomer. He was born in Macao, China, the son of John William Roberts of the East India Company and was educated at Mr Styles' Classical Academy in Thames Ditton and at the Addiscombe Military Seminary for service in the East India Company (the HEIC).

Key takeaways

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

Reference excerpt

Manuel John Johnson, FRS (23 May 1805 – 28 February 1859) was a British astronomer. He was born in Macao, China, the son of John William Roberts of the East India Company and was educated at Mr Styles' Classical Academy in Thames Ditton and at the Addiscombe Military Seminary for service in the East India Company (the HEIC). In 1823 he was sent by the HEIC to St Helena, where from 1826 he supervised the building of the Ladder Hill Observatory. He travelled twice to South Africa to consult with Fearon Fallows on the design of the observatory. In 1828 he was made Superintendent of the Observatory. In 1835 he published A Catalogue of 606 Principal Fixed Stars in the Southern Hemisphere... at St. Helena, for which he won the Gold Medal of the Royal Astronomical Society that same year. While comparing his results with those of Nicolas Louis de Lacaille he noted the high proper motion of Alpha Centauri and communicated these to Thomas Henderson at the Royal Observatory, Cape of Good Hope. This led to the first successful measurement of a stellar parallax, though not to the first publication thereof. On his return to the UK in 1833 he went up to Magdalen Hall, Oxford, graduating MA in 1839. He then served as director of the Radcliffe Observatory from 1839 until his death in Oxford in 1859. He introduced there self-registering meteorological instruments to continuously record variations in atmospheric pressure, temperature, humidity and atmospheric electricity using the recent invention of photography. The initial instruments were invented and installed by Francis Ronalds, Honorary Director of the Kew Observatory. The Radcliffe Observatory later became part of the network of observing stations established as part of the new Meteorological Office and coordinated from Kew. Johnson was president of the Royal Astronomical Society in 1855–1857 and was elected Fellow of the Royal Society in 1856. In 1850 he married Caroline (born 1822), the daughter of James Adey Ogle, regius professor of medicine at Oxford, and his wife Sarah. Caroline's twin sister Amelia married James Bowling Mozley, regius professor of divinity at Oxford. After the death of Johnson and (in 1872) Amelia, Caroline lived with Mozley and assisted in his parish work at Shoreham. She died in 1881.

Notes

References Obituary, Monthly Notices of the Royal Astronomical Society, Vol. 20, 1860, p.123 Johnson; Manuel John (1805 - 1859) - Past Fellows, Royal Society Grave of Manuel Johnson in St Sepulchre's Cemetery, Oxford, with biography Obituary: "The Late Radcliffe Observer", The Times, 4 March, 1859, p5.

Worked examples

Example 1 — a first encounter with Manuel John Johnson

Start with the simplest possible case. Write down what Manuel John Johnson 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 Manuel John Johnson 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 Manuel John Johnson 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 Manuel John Johnson

In research: Manuel John Johnson 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 Manuel John Johnson 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: Manuel John Johnson is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1805 births, 1859 deaths, 19th-century British astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Manuel John Johnson 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 Manuel John Johnson in 20 minutes

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

Frequently asked questions

What is Manuel John Johnson in simple terms?

Why does Manuel John Johnson 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 Manuel John Johnson?

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 Manuel John Johnson.