The wild planet where humans live originated from the boundless darkness. More than four billion years ago, at the beginning of the birth of the earth, it was just a small stone. As meteorite fragments and celestial dust continue to be absorbed in the solar system, it gradually becomes larger and rounder. Today, the earth has become a blue-white planet. Among them, the blue part is the ocean on the earth's surface, and the white part is the sea water rising into the air. The Earth can rotate without external force.

The Earth is like a crazy spinning disk. When its speed reaches 1,000 miles per hour, hot magma will erupt from its body. One by one, icebergs the size of an average house broke off and drifted into the sea. Rainwater carves the glacier into a bowl shape. Islands emerge from the ocean floor. Additionally, the ever-changing clouds often angrily hurl thunder and lightning at the ground. Although the Earth has been spinning since birth, its speed is never constant. After all, our planet has never been equipped with any control switches.

When the asteroid Earth was born, it rotated at an astonishing speed, reaching 4,000 miles per hour - at that time, there were only 6 hours of day and night on the Earth. But after a few centuries, the Earth's rotation began to slow down. One of the main factors causing the Earth's rotation to slow down is the phenomenon of tides on Earth. The rise and fall of the ocean affects a planet like the braking system affects a car traveling at high speeds. Since tides are primarily caused by the Moon's gravity, much of the slowdown in the Earth's rotation is due to our planet possessing the Moon, a large satellite.

The International Earth Rotation Bureau has been recording changes in the Earth's speed, which may sound a bit strange. However, as the decision-maker on whether to change the current world time system, the International Earth Rotation Bureau's efforts are to keep our clocks consistent with a changing world.