how much of the sky are you seeing when you look at it from the ground?

Question

how can it be half? wouldn't it be less than half if the earth is so huge?

Answer 1

From the middle of the ocean, with no land, trees, or buildings to obscure your view, you are seeing exactly half, as measured by subtended angle. You are standing on a plane tangent to the earth's surface at that point. You can see everything above that plane, and nothing below that plane. As you move higher above that plane, the subtended angle increases, and you can see more.

Answer 2

> Half, Frank N, Fine, if the Earth was Not a Sphere.

Answer 3

For all practical purposes, half. Hopefully someone will answer my question below to put some numbers on what "for all practical purposes" means.

Answer 4

1/100th

Answer 5

infinity