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History
Horizon
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The horizon is the apparent curve that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body. This curve divides all viewing directions based on whether it intersects the relevant body's surface or not.
The curvature of the horizon is easily seen in this 2008 photograph, taken from a Space Shuttle at an altitude of 226 km (140 mi).
The curvature of the horizon is easily seen in this 2008 photograph, taken from a Space Shuttle at an altitude of 226 km (140 mi).
View of the ocean with two ships: one in the foreground and one to the left of it on the horizon
View of the ocean with two ships: one in the foreground and one to the left of it on the horizon
A view across a 20-km-wide bay in the coast of Spain. Note the curvature of the Earth hiding the base of the buildings on the far shore.
A view across a 20-km-wide bay in the coast of Spain. Note the curvature of the Earth hiding the base of the buildings on the far shore.
Typical desert horizon
Typical desert horizon
Sky
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The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space.
View of the night sky in July from Earth
View of the night sky in July from Earth
The day's blue sky, clouds and the Moon
The day's blue sky, clouds and the Moon
Sky during day time
Sky during day time
The crescent Moon remains visible just moments before sunrise.
The crescent Moon remains visible just moments before sunrise.