Horizon

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Horizon.
Horizon.
View of Earth's horizon as seen from Space Shuttle Endeavour, 2002.
View of Earth's horizon as seen from Space Shuttle Endeavour, 2002.

The horizon (from Greek orizein, to limit) is the line that separates earth from sky. But at many places the true horizon is not to be seen as there are trees, buildings, mountains and so forth. What you see then is known as the visible horizon.

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