science

Saint Helena meridian

Saint Helena meridian 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 Saint Helena meridian rather than just read about it. In short: Saint Helena meridian (French: méridian de Sainte-Hélène) begins at the initial point of the Washington meridian, in latitude 31° north, and longitude 91° 09′ 15″ west of Greenwich, passing one mile east of Baton Rouge, extends south to the Mississippi River, and governs the surveys in the Greensburg and southeastern districts of Louisiana, east of the Mississippi River. The Saint Helena meridian has a common initia…

Key takeaways

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

Reference excerpt

Saint Helena meridian (French: méridian de Sainte-Hélène) begins at the initial point of the Washington meridian, in latitude 31° north, and longitude 91° 09′ 15″ west of Greenwich, passing one mile east of Baton Rouge, extends south to the Mississippi River, and governs the surveys in the Greensburg and southeastern districts of Louisiana, east of the Mississippi River. The Saint Helena meridian has a common initial point with the Washington meridian, which runs north from the initial point and governs cadastral surveys in southwestern Mississippi. The Saint Helena meridian is located along the east line of Township 1 South, Range 1 West as the Townships and Ranges are numbered East of the Mississippi River. The meridian is found along the Louisiana baseline from its point of intersection with the Mississippi River traversing eastward to the fifth township's east line. The Saint Helena meridian is in East Feliciana Parish. The Saint Helena meridian is not found in the adjoining Saint Helena Parish from which it takes its name.

Sources Raymond, William Galt (1914). Plane Surveying for Use in the Classroom and Field (via Internet Archive). New York: American Book Company.

See also List of principal and guide meridians and base lines of the United States

External links "Cadastral Survey [St. Helena Meridian]". U.S. Bureau of Land Management. Archived from the original on 2013-01-05. Retrieved 2012-10-06. "Principal Meridians and Base Lines". U.S. Bureau of Land Management. Archived from the original on 2012-10-18. Retrieved 2012-10-06. "Washington and St Helena". Principal Meridian Project. Retrieved 2012-10-06. "Washington/St. Helena Meridian". The Center for Land Use Interpretation. Retrieved 2012-10-06.

Illustrations

Worked examples

Example 1 — a first encounter with Saint Helena meridian

Start with the simplest possible case. Write down what Saint Helena meridian 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 Saint Helena meridian 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 Saint Helena meridian 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 Saint Helena meridian

In research: Saint Helena meridian 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 Saint Helena meridian 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: Saint Helena meridian is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geography of Louisiana, Meridians and base lines of the United States, Named meridians, so understanding it makes those chapters shorter.
In everyday life: Look for Saint Helena meridian 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 Saint Helena meridian in 20 minutes

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

Frequently asked questions

What is Saint Helena meridian in simple terms?

Why does Saint Helena meridian 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 Saint Helena meridian?

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 Saint Helena meridian.