The earth is like a crazy spinning disk. When its speed reaches 1000 miles per hour, hot magma will be ejected from its body. Icebergs the size of ordinary houses have broken and drifted with the tide. Rain carved the glacier into a bowl. Islands emerged from the bottom of the sea. In addition, changing clouds often throw lightning at the ground angrily. Although the earth was born to rotate all the time, its speed was never constant. After all, our planet has never been equipped with any control switches.
When the asteroid Earth was born, it spun at an amazing speed, reaching 4000 miles per hour-at that time, there were only six hours of day and night on the Earth. But centuries later, the rotation speed of the earth began to slow down. One of the main factors leading to the decrease of the earth's rotation speed is the tidal phenomenon on the earth. The ups and downs of the ocean affect a planet, just as the braking system affects a high-speed car. Because tides are mainly caused by the gravity of the moon, the slowdown of the earth's rotation is largely due to the fact that our planet has the big moon.
Strange as it sounds, the International Bureau of Earth Rotation has been recording the changes of the earth's speed. However, as the decision-maker of whether to change the current world time system, the International Earth Rotation Bureau strives to keep our clocks in line with the ever-changing world.