シャドーイング練習: Why Does the Sky Turn Red at Sunset? - 動画で英語スピーキングを学ぶ

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Have you ever looked outside just before the sun disappears and noticed the sky suddenly turning orange, red or even pink?
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It can look almost unreal, especially when the clouds catch the sunlight and seem to glow.
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But why does the sky change color at sunset when it looks blue for most of the day?
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The answer has to do with sunlight, Earth's atmosphere, and the way different colors of light travel through the air.
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And surprisingly, the beautiful red sunset we see is created by the same atmosphere that gives us our familiar blue daytime sky.
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So, today we'll uncover, why does the sky turn red at sunset?
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What exactly happens to sunlight as the sun moves toward the horizon?
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Let's take a closer look, right here, on History of Simple Things.
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To understand a sunset, we first need to understand sunlight.
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Although sunlight appears white to our eyes, it is actually made up of many different colors of visible light.
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You can think of sunlight as a mixture of red, orange, yellow, green, blue, and violet light.
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Each color has a different wavelength.
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Red light has a longer wavelength, while blue and violet light have much shorter wavelengths.
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When sunlight travels through space, these different colors generally move together.
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But once sunlight enters Earth's atmosphere, things become more interesting.
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The atmosphere contains countless tiny molecules, especially nitrogen and oxygen.
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When sunlight passes through these molecules, some of the light is scattered in different directions.
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And this scattering is the key to understanding both blue skies and red sunsets.
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During most of the day, sunlight reaches us after traveling through a relatively short path through the atmosphere.
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The shorter wavelengths, particularly blue and violet, are scattered much more strongly than the longer wavelengths, such as red and orange.
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This process is called Rayleigh scattering.
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So instead of all the sunlight traveling directly from the sun to our eyes, some of the blue light gets scattered across the sky.
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Our eyes are more sensitive to blue than violet, and some violet light is also absorbed or distributed differently in the atmosphere.
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As a result, the sky generally appears blue.
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This is why, when you look away from the sun on a clear day, you're not seeing empty blue space.
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You're seeing sunlight that has been scattered through the atmosphere.
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But as sunset approaches, the path sunlight takes through the atmosphere changes dramatically.
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As Earth rotates, the sun appears to move lower and lower toward the horizon.
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The important thing is that the sun isn't simply becoming weaker because it's farther away.
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Instead, sunlight has to travel through much more atmosphere before reaching your eyes.
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Imagine shining a flashlight through a short layer of fog.
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Most of the light can pass through fairly easily.
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Now, imagine sending that same flashlight through a much longer layer of fog.
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More of the light gets scattered or absorbed along the way.
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Something similar happens during sunset.
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When the sun is high overhead, its light takes a relatively short route through the atmosphere.
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But when the sun is near the horizon, its light travels through a much longer stretch of air.
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That longer journey changes which colors are most likely to reach your eyes directly.
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As sunlight travels through this much longer atmospheric path, the shorter blue and violet wavelengths encounter many more air molecules.
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Because they scatter so easily, much of that blue light is redirected away from the original path of the sunlight.
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What remains traveling more directly toward us contains proportionally more of the longer wavelengths.
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These include yellow, orange, and especially red light.
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That's why the setting sun can appear yellow, orange, or deep red, while the surrounding sky can take on warm colors.
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The atmosphere hasn't suddenly produced red light.
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The red light was already part of the sunlight.
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The atmosphere simply changes how much of each color reaches our eyes.
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In a way, a sunset is like a natural filter created by Earth's atmosphere.
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If red light is what survives the longest atmospheric journey, why don't sunsets always look completely red?
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That's because several colors can still reach our eyes depending on atmospheric conditions and the position of the sun.
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Orange and yellow wavelengths are longer than blue and scatter less easily, so they can continue traveling through the atmosphere atmosphere.
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This mixture can create the familiar golden and orange colors we often see before sunset.
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Sometimes the sky can even become pink, purple, or magenta.
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These colors can appear when different wavelengths of scattered and direct sunlight mix together,
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particularly when the atmosphere contains clouds or particles that scatter light in different ways.
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The exact colors depend on what is happening in the atmosphere at that particular moment.
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That's one reason every sunset can look slightly different.
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A sunset is a simple demonstration of how light interacts with Earth's atmosphere.
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During the day, blue light scatters strongly, giving us a blue sky.
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But as the sun approaches the horizon, its light travels through much more atmosphere.
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More blue light is scattered away while the longer red and orange wavelengths become more visible.
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Clouds, dust, and other particles can then add even more color, creating the beautiful sunsets we see.
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So, why does the sky turn red at sunset?
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It's because sunlight travels through much more atmosphere when the sun is near the horizon.
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The blue light gets scattered away, leaving more red, orange, and yellow light for us to see.
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So the next time you see a red sunset,
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remember, you're watching sunlight interact with Earth's atmosphere in a beautiful everyday display of science.
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experience.
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このレッスンの語彙とスピーキングのポイント

この動画には、シャドーイング用の文が67文、単語が937語あります。 音声の長さは7:45です。 話す速さは1分あたり約121語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は78%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくるやや難しい単語15語を、発音と意味つきで紹介します。

  • atmosphere /ˈætməsˌfɪɹ/ (名詞) — 大気, 大気圏. The gases surrounding the Earth or any astronomical body.
  • sunlight /ˈsʌnˌlaɪt/ (名詞) — 日光, 太陽光. All the electromagnetic radiation given off by the Sun; especially, that in the visible spectrum and that bathes the Earth.
  • sunset /ˈsʌnˌsɛt/ (名詞) — 日没, 日の入り. The moment each evening when the sun disappears below the western horizon.
  • violet /ˈvaɪ.ə.lət/ (名詞) — 菫, スミレ. A plant or flower of the genus Viola, especially the fragrant Viola odorata; (inexact) similar-looking plants and flowers.
  • horizon /həˈɹaɪ.zən/ (名詞) — 地平線, 水平線. The visible horizontal line (in all directions) where the sky appears to meet the earth in the distance.
  • cloud /ˈklaʊ̯d/ (名詞) — 雲, 雲霞. A visible mass of water droplets suspended in the air.
  • molecule /ˈmɑ.lɪ.kjul/ (名詞) — 分子. The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by…
  • layer /ˈleɪ̯ɚ/ (名詞) — 層, 膜. A single thickness of some material covering a surface.
  • visible /ˈvɪzɪb(ə)l/ (形容詞) — 見える, 目に見える. Able to be seen.
  • depend /dɪˈpɛnd/ (動詞) — 依存する. To be contingent or conditioned; to have something as a necessary condition
  • interact /ɪn.təˈɹækt/ (動詞) — 相互作用する, 相呼応する. To engage in communication and other shared activities (with someone).
  • particle /ˈpɑɹtək(ə)l/ (名詞) — 粒子. A very small piece of matter, a fragment; especially, the smallest possible part of something.
  • absorb /æbˈsɔɹb/ (動詞) — 吸収する. To include so that it no longer has separate existence; to overwhelm; to cause to disappear as if by swallowing up; to incorporate; to assimilate; to take in…
  • sensitive /ˈsɛn.sɪt.ɪv/ (形容詞) — 敏感な. Having the faculty of sensation; pertaining to the senses.
  • dust /dʌst/ (名詞) — 埃, ほこり. Fine, dry particles of matter found in the air and covering the surface of objects, typically consisting of soil lifted up by the wind, pollen, hair, fiber…

注意したい発音

話し手はyou're, don't, hasn'tなど、短縮形や弱形を7回使っています。聞こえたとおりの短い形で発音しましょう。

  • 「sh」と「zh」の音: shine /ʃaɪn/, demonstration /dɛmənˈstɹeɪʃən/, flashlight /ˈflæʃˌlaɪt/, proportionally /pɹəˈpɔɹʃənəli/
  • 長い単語（アクセントの位置に注意）: atmospheric /ˌætməsˈfɛɹɪk/, differently /ˈdɪf.ə.ɹənt.li/, surprisingly /səˈpɹaɪzɪŋli/, demonstration /dɛmənˈstɹeɪʃən/, proportionally /pɹəˈpɔɹʃənəli/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
  3. 自分の声を録音して元の音声と比べます。atmosphere, sunlight, sunsetなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →