There is no solid boundary called the 'sky'. The blue thing overhead is just the sunlight being scattered by the atmosphere and blue is the colour that is scattered the most and therefore the 'sky' appears blue to us. Now, there is no gap between the Earth and the atmosphere (which I guess you could call the sky) so the answer to your question would be immediately above land. Even where you're standing is 'sky.'
It is generally called "the horizon".
The horizon line, or simply the horizon.
That's the horizon.
it means that it goes to the horizon because the horizon looks like it meets the sky
The sky and the land meet.
essay on earth in hindi
the earth
Megacryometeor
The boundary between Earth and sky is known as the horizon
Horizon
The horizon is the name normally used. hyposinthnise
It's called the horizon. By definition, a horizon is the line where earth's surface appears to meet the sky. Horizon can also mean the limit to a person mental perception.
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.
the horizon
Horizon
The horizon.
Horizon Line
It is the horizon.
It is called the horizon.
Sky