Surveying
The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called

Celestial horizon
Sensible horizon
Visible horizon
True horizon

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Surveying
The length of a chain is measured from

inside of one handle to inside of other handle
outside of one handle to outside of other handle
centre of one handle to centre of other handle
outside of one handle to inside of other handle

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