If you're talking about sky as in sky on this planet, then your answer would be the horizon (the point were the ground meets the sky from any vantage point on the surface). Or you could be talking about the atmosphere, which is the boundary between the earth and space and keeps life alive, and air on earth.
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Technically the Earth and the sky never just meet. The Earth is floating in the atmosphere which is always touching the sky. But if you look to the horizon, it looks like they touch.
The line in the sky from horizon to horizon is called the horizon line. It is the apparent line that separates the Earth from the sky when looking out into the distance.
The horizon is the name of the line where the sky and earth appear to meet.
The line where the earth and the sky seems to meet is called horizon.
The Horizon line
The term "horizon" existed before the naming of a horizontal line. The concept of the horizon, meaning the line where the earth meets the sky, has been around for centuries. The naming of a horizontal line likely came afterward as a way to describe a line that is parallel to the horizon.
The horizon is where the ground and sky appear to meet at eye level. It is the apparent line that separates the Earth from the sky when viewed from a specific vantage point.
At sea level, the horizon appears to be the point where the sky seems to meet the ocean. This is due to the curvature of the Earth, which creates the illusion of a flat line separating the sky and the sea.
The zenith is the point directly overhead in the sky, while the horizon is the line where the sky appears to meet the Earth. The zenith is the highest point above an observer, while the horizon represents the farthest visible point on the Earth's surface.