astronomy

Sidewalk astronomy

Sidewalk astronomy 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 Sidewalk astronomy rather than just read about it. In short: Sidewalk astronomy or street corner astronomy refers to the activity of setting up a telescope in an urban place on a for-profit or non-profit basis as entertainment and/or for public education. Overview Examples of people setting up telescopes on urban streets for public astronomical viewing go back well into the 19th century and maybe even further.

Key takeaways

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

Reference excerpt

Sidewalk astronomy or street corner astronomy refers to the activity of setting up a telescope in an urban place on a for-profit or non-profit basis as entertainment and/or for public education.

Overview Examples of people setting up telescopes on urban streets for public astronomical viewing go back well into the 19th century and maybe even further. Sidewalk astronomers and their telescopes have been a common sight in most big cities. There are many examples in the past such as Frank Manning in New Orleans as early as 1930 and Mr Grosser in Los Angeles in the 1870s, who not only set up a telescope but also an illuminated microscope. Some sidewalk "pitch men" charged the public to view astronomical objects through their telescope but other astronomers allow people to view for free. In more recent years sidewalk astronomy has come to be more associated with altruistic individuals or groups offering views of the nighttime sky as a free public educational service. Because the sidewalks tend to be in light-polluted areas, sidewalk astronomers often coordinate their activities at times when brighter celestial objects like planets, the Moon, and bright stars are visible. During the day, sidewalk astronomy often includes the use of a solar filter on the telescope to allow people to view the Sun. Telescopes are often larger than the average available "department store telescope", sometimes very large.

Amateur astronomical activities

With the advent and growth of organized amateur astronomical groups, sidewalk astronomy has come to be associated with public education about astronomy via free public viewing for anyone who wishes to look through the telescope. This usually involves individual or a group of amateur astronomers with small-to-medium-sized telescopes. Organizations such as the San Francisco Sidewalk Astronomers, founded by John Dobson, are organized around the idea of educating people about the universe they live in by having them look through telescopes. Dobson even promoted a design for large inexpensive reflecting telescope that he called a "Sidewalk Telescope", more commonly referred to as the Dobsonian telescope.

See also Amateur astronomy Citizen science Star party A Sidewalk Astronomer, 2005 documentary about John Dobson's activities, including sidewalk astronomy

References

Smithsonian article Space article

External links 35 Who Made a Difference: John Dobson, Smithsonian article Website of the San Francisco Sidewalk Astronomers Adventures in Street Corner Astronomy, Popular Science Mar 1921 Frederick News Post - What's it like ... to be a street corner astronomer?

Illustrations

Worked examples

Example 1 — a first encounter with Sidewalk astronomy

Start with the simplest possible case. Write down what Sidewalk astronomy 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 Sidewalk astronomy 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 Sidewalk astronomy 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 Sidewalk astronomy

In research: Sidewalk astronomy 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 Sidewalk astronomy 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: Sidewalk astronomy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Amateur astronomy, so understanding it makes those chapters shorter.
In everyday life: Look for Sidewalk astronomy 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 Sidewalk astronomy in 20 minutes

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

Frequently asked questions

What is Sidewalk astronomy in simple terms?

Sidewalk astronomy or street corner astronomy refers to the activity of setting up a telescope in an urban place on a for-profit or non-profit basis as entertainment and/or for public education. Overview Examples of people setting up telescopes on urban streets for public astronomical viewing go ba…

Why does Sidewalk astronomy 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 Sidewalk astronomy?

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 Sidewalk astronomy.