determined in greenwich civil time when it is a) 8:35 AM at 90 degree west longitude b) 10:08AM at 120 degree east longitude c) 9:39 PM at 150 east longitude d) 11:53 PM at 150 degree West Longitude e) 7:00 PM at 145 degree West longtude

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Control Survey and Geodetic reductions

Control surveys or survey controls are used to establish reference points as a basis for various construction activities. Vertical and horizontal control points are to be established in a control survey to increase accuracy. After establishing the control points, all other types of surveys such as topographic, right-of-way, aerial mapping, construction layout, boundary surveys, and utility mapping can be worked upon so that control networks can be formed. The place from which the observations are made is called a survey station.