第 2 單元，第 1 課
Earth's Motion Around the Sun地球繞日運動
點卡片翻面。
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- rotation axis自轉軸Earth’s rotation axis is tilted.
- rotation自轉Earth’s rotation causes day and night.
- apparent motion視運動The Sun’s apparent motion is from east to west.
- orbit軌道The Moon’s orbit around Earth is nearly circular.
- revolution公轉One revolution of Earth takes a year.
- gravity重力（萬有引力）Gravity holds the planets in orbit.
- solstice至日（夏至、冬至）The June solstice has the longest day in Taipei.
- equinox分點（春分、秋分）On the equinox, day and night are about equal.
這課的重點字
- rotation axis自轉軸
- rotation自轉
- apparent motion視運動
- orbit軌道
- revolution公轉
- gravity重力（萬有引力）
- solstice至日（夏至、冬至）
- equinox分點（春分、秋分）