Surveying
The difference in longitude of two places expressed in time is equal to the difference in their

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Apparent solar time
Sidereal time
Mean solar time

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the three angles of a plane triangle should be 180°
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The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the angles around a station should be 360°

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