*何故月は潮の満ち引きを起こすのか？
海の水は一日に何度も満ちたり引いたりします。これは「月の引力」が原因です。月は地球を強く引っ張る力を持っており、その影響で海の水が月の方向に盛り上がります。地球の反対側でも同じように水が盛り上がるため、一日に2回ずつ満ち潮と引き潮が起こります。太陽と月と地球が一直線に並ぶ満月や新月の時には、どちらの引力にも引っ張られて特に差が大きくなり、大潮と呼ばれます。海へ行っ時は太陽や月の動きを想像しながら潮の満ち干きを見てみましょう。
*Why Does the Moon Cause Tides?
The ocean’s water rises and falls several times a day, and this is due to the Moon’s gravitational pull. The Moon exerts a strong force on the Earth, causing the water to bulge toward it. On the opposite side of the Earth, water also bulges in a similar way, which is why we experience two high tides and two low tides each day. During a full moon or a new moon, when the Sun, Moon, and Earth are aligned, both gravitational forces combine, creating particularly high and low tides known as spring tides. When you visit the sea, try observing the tides while imagining the movements of the Moon and the Sun influencing the water.
