astronomy

Stephen Demainbray

Stephen Demainbray 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 Stephen Demainbray rather than just read about it. In short: Stephen Charles Triboudet Demainbray (1710 – 20 February 1782) was an English natural scientist and astronomer, who was Superintendent (or King's Astronomer) at the King's Observatory in Richmond, Surrey (now in London) from 1768 to 1782. Early life and education Demainbray was born in the parish of St Martins, London in 1710.

Key takeaways

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

Reference excerpt

Stephen Charles Triboudet Demainbray (1710 – 20 February 1782) was an English natural scientist and astronomer, who was Superintendent (or King's Astronomer) at the King's Observatory in Richmond, Surrey (now in London) from 1768 to 1782.

Early life and education

Demainbray was born in the parish of St Martins, London in 1710. His parents, (Charles) Stephen Demainbray (d.c. 1710) and Mary, daughter of Rev Alexander Descairac, were married on 21 September 1699 at St Mary Magdalen Old Fish Street, London. His father, who had come to England from France following the revocation of the Edict of Nantes, died soon afterwards and he was brought up by his uncle, Captain Peter Demainbray (d. 1733) who placed him at Westminster School. There he studied under Dr Desaguliers, who taught him mathematics and natural philosophy. After that he went to Leiden University in the Netherlands.

Career From 1740 to 1742 Demainbray lectured in experimental philosophy in Edinburgh. The 1745 Jacobite Rising brought him to take arms for the government for four years, and he was a volunteer at the Battle of Prestonpans. In 1746 he resumed his lectures, and worked on the influence of electricity on vegetables. Three years later, he began travelling throughout Britain and Europe, lecturing in Dublin and Paris. In 1753, he was invited to London by the Prince of Wales, later George III, and the Duke of York. He returned to England in 1755 and read a public course of lectures in the concert-room in Panton Street, and later gave private courses to members of the royal family, including the future King George III. In 1768, he was appointed Superintendent of the King's Observatory (or King's Astronomer) in Richmond, which King George III had commissioned from Sir William Chambers. He arranged for George III to see the Transit of Venus on 3 June 1769. He held that appointment until his death on 20 February 1782. His assistant there was James Stephen Rigaud, who married Demainbray's daughter Mary in Richmond in 1771.

Personal life In London on 22 February 1726, in a clandestine marriage, Demainbray married his first wife, Mary Worsham (d. 1755 Montpellier, France) and they had five children. Only their daughter Mary survived to adulthood; she married James Stephen Rigaud. In 1755 he married, at St Anne's Church, Soho, his second wife, Sarah Horne (a sister of John Horne Tooke), and fathered a further four children including Stephen George Francis Triboudet Demainbray.

Legacy Demainbray's instruments were combined with the King's collection and given to King's College London and then, in 1927, to the Science Museum.

References

Worked examples

Example 1 — a first encounter with Stephen Demainbray

Start with the simplest possible case. Write down what Stephen Demainbray 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 Stephen Demainbray 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 Stephen Demainbray 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 Stephen Demainbray

In research: Stephen Demainbray 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 Stephen Demainbray 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: Stephen Demainbray is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1710 births, 1782 deaths, 18th-century English astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Stephen Demainbray 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 Stephen Demainbray in 20 minutes

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

Frequently asked questions

What is Stephen Demainbray in simple terms?

Why does Stephen Demainbray 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 Stephen Demainbray?

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 Stephen Demainbray.