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we have a horizon which means that we cannot see all of the earths surface
Horizon line. :)
The angle below horizontal that an observer must look to see an object that is lower than the observer. Note: The angle of depression is congruent to the angle of elevation (this assumes the object is close enough to the observer so that the horizontals for the observer and the object are effectively parallel; this would not be the case for an astronaut in orbit around the earth observing an object on the ground).
The horizon is the name normally used. hyposinthnise
They believed it was like a giant plane, and that if you went too far toward the horizon you would fall off the edge of the earth.
The horizon.
Exactly due north of him, and on the horizon.
During a full moon, the moon appears fully illuminated and bright in the sky. It will be visible throughout the night, rising as the sun sets and setting as the sun rises.
it would still appear to rotate
A circle through the Earth's sphere perpendicular to the observer's latitude
The horizon appears straight due to the curvature of the Earth. If it seems to curve in photos, it could be due to the lens or distortion in the image.
The North Star (Polaris) appears closest to the horizon at the Earth's equator (0° latitude) because as you move away from the equator towards the poles, the angle of Polaris above the horizon increases. At the North Pole (90° latitude), Polaris is directly overhead.
It depends on its intrinsic brilliance and its distance from the observer
The line where the sky and the earth or sea appear to meet is called the horizon.
The zenith is the direction directly above the observer. The astronomical horizon is the plane that is perpendicular to that direction, i.e. horizontal. The "true horizon", however, is the cone from the observer to the point on the earth, below which you can not "see over", so it is a small amount lower in angle. In practice, the two horizons can be considered to be the same, because the height of the observer is often small in comparision to the diameter of the earth, unless the observer is standing on a tall point, such as a mountain.
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.
No, the celestial equator does not always pass directly overhead. The position of the celestial equator in the sky is determined by the observer's latitude on Earth. If the observer is located at the equator, the celestial equator will pass directly overhead. However, for observers at different latitudes, the celestial equator will appear at an angle to the horizon.