science

Sun chart

Sun chart 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 Sun chart rather than just read about it. In short: A Sun chart is a plot of the ecliptic of the Sun through the sky throughout the year at a particular location (longitude and latitude) on Earth. Description Most sun charts plot azimuth versus altitude throughout the days of the winter solstice and summer solstice, as well as a number of intervening days.

Key takeaways

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

Reference excerpt

A Sun chart is a plot of the ecliptic of the Sun through the sky throughout the year at a particular location (longitude and latitude) on Earth.

Description Most sun charts plot azimuth versus altitude throughout the days of the winter solstice and summer solstice, as well as a number of intervening days. Since the apparent movement of the Sun as viewed from Earth is nearly symmetrical about the solstice, plotting dates for one half of the year gives a good approximation for the rest of the year. Thus, to simplify the diagram, some sun charts show days for different months as the same, e.g. March 21 equals September 21. The accompanying sun chart for Berlin accounts for deviations in symmetry between the two halves of the year through the use of the analemma, represented by each figure eight on the chart. The graph may show the entire horizon or only that half of the horizon closest to the equator. Sky view obstructions can be superimposed upon a Sun chart to obtain the insolation of a location.

Illustrations

Worked examples

Example 1 — a first encounter with Sun chart

Start with the simplest possible case. Write down what Sun chart 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 Sun chart 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 Sun chart 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 Sun chart

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

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

Frequently asked questions

What is Sun chart in simple terms?

A Sun chart is a plot of the ecliptic of the Sun through the sky throughout the year at a particular location (longitude and latitude) on Earth. Description Most sun charts plot azimuth versus altitude throughout the days of the winter solstice and summer solstice, as well as a number of intervenin…

Why does Sun chart 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 Sun chart?

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 Sun chart.