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Star (classification)

Star (classification) 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 Star (classification) rather than just read about it. In short: Star ratings are a type of rating scale using a star symbol or similar typographical mark. It is used by reviewers for ranking things such as films, TV shows, restaurants, and hotels.

Star (classification) — main illustration
Star (classification) — illustration

Key takeaways

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

Reference excerpt

Star ratings are a type of rating scale using a star symbol or similar typographical mark. It is used by reviewers for ranking things such as films, TV shows, restaurants, and hotels. For example, a system of one to five stars is commonly used in hotel ratings, with five stars being the highest rating. Similar systems have been proposed for electing politicians in the form of score voting and STAR voting.

Historical usage Repeated symbols used for a ranking date to Mariana Starke's 1820 guidebook, which used exclamation points to indicate works of art of special value:

...I have endeavored... to furnish Travellers with correct lists of the objects best worth notice...; at the same time marking, with one or more exclamation points (according to their merit), those works which are deemed peculiarly excellent.

Murray's Handbooks for Travellers and then the Baedeker Guides (starting in 1844) borrowed this system, using stars instead of exclamation points, first for points of interest and later for hotels. The Michelin restaurant guide introduced a star as a restaurant rating in 1926, which was expanded to a system of one to three stars in 1931.

Media

Books In 1915, Edward O'Brien began editing The Best American Short Stories. This annual compiled O'Brien's personal selection of the previous year's best short stories. O'Brien claimed to read as many as 8,000 stories a year, and his editions contained lengthy tabulations of stories and magazines, ranked on a scale of zero to three stars, representing O'Brien's notion of their "literary permanence." He further listed stories with a ranking of three stars "in a special 'Roll of Honor.'" In this list, O'Brien attached an additional asterisk to those stories that he personally enjoyed. Oliver Herford's essay Say it with Asterisks, quips "Never, I think, were a mob of overworked employees so pitifully huddled together in an ill-ventilated factory as are the Asterisks in this Sweatshop of Twaddle." Literary editor Katrina Kenison dismisses O'Brien's grading systems as "excessive at best, fussy and arbitrary at worst." Book reviewers generally do not use a star-rating system though there are exceptions. The West Coast Review of Books rates books on a scale of one ("poor") to five ("superior") stars. According to editor D. David Dreis, readers love the ratings but publishers don't.

Films In the 31 July 1928 issue of the New York Daily News, the newspaper's film critic Irene Thirer began grading movies on a scale of zero to three stars. Three stars meant 'excellent,' two 'good,' and one star meant 'mediocre.' And no stars at all 'means the picture's right bad,'" wrote Thirer. Carl Bialik speculates that this may have been the first time a film critic used a star-rating system to grade movies. "The one-star review of The Port of Missing Girls launched the star system, which the newspaper promised would be 'a permanent thing.' According to film scholar Gerald Peary, few newspapers adopted this practice until the French film magazine Cahiers du cinéma "started polling critics in the 1950s and boiling their judgment down to a star rating, with a bullet reserved for movies that the magazine didn't like." The highest rating any film earned was five stars. The British film magazine Sight and Sound also rated films on a scale of one to four stars. Some critics use a "half-star" option in between basic star ratings. Leonard Maltin goes one further and gives Naked Gun 33+1⁄3: The Final Insult a 2+1⁄3 star rating. Critics do not agree on what the cutoff is for a recommendation, even when they use the same scale. Gene Siskel and Roger Ebert "both consider[ed] a three-star rating to be the cutoff for a "thumbs up" on their scales of zero to four stars. Film critic Dave Kehr—who also uses a 0–4 star scale—believes "two stars is a borderline recommendation". On a five-star scale, regardless of the bottom rating, 3 stars is often the lowest positive rating, though judging on a purely mathematical basis, 2 1/2 stars would be the dividing line between good and bad on a 0–5 scale. Common Sense Media uses a scale of one to five, where 3 stars are "Just fine; solid" and anything lower is "Disappointing" at best. There is no agreement on what the lowest rating should be. Some critics make "one star" or a "half-star" their lowest rating. Dave Kehr believes that "one star" indicates the film has redeeming facets, and instead uses zero stars as his lowest rating. Examples of rating scales:

… excerpt ends here. Continue reading the full article.

Illustrations

Star (classification): "Five-star superior" rating at the Hotel Vier Jahreszeiten Kempinski in Munich, Germany
"Five-star superior" rating at the Hotel Vier Jahreszeiten Kempinski in Munich, Germany

Worked examples

Example 1 — a first encounter with Star (classification)

Start with the simplest possible case. Write down what Star (classification) 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 Star (classification) 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 Star (classification) 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 Star (classification)

In research
Star (classification) 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 Star (classification) 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
Star (classification) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Military ranks, Rating systems, Reputation management, so understanding it makes those chapters shorter.
In everyday life
Look for Star (classification) 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 Star (classification) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Star (classification) means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Star (classification) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Star (classification) in simple terms?

Star ratings are a type of rating scale using a star symbol or similar typographical mark. It is used by reviewers for ranking things such as films, TV shows, restaurants, and hotels.

Why does Star (classification) 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 Star (classification)?

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 Star (classification).

Tags

  • Military ranks
  • Rating systems
  • Reputation management
  • Star ranking systems
  • Star symbols

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