What is the Greenwich Civil Time (GCT) when at a given instant the standard or mean time at: a. 120 degrees East longitude is 4:45 PM? b. 120 degrees East longitude is 9:30 PM? c. 90 degrees West longitude is 3:15 AM? d. 75 degrees West longitude is 4:45 PM? e. 150 degrees West longitude is 10:05 PM?

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Errors in surveying

An error in surveying is defined as the difference between two or more values of an identical quantity. However, the estimates are never accurate and there will always be a degree of variability regardless of the research tool or method used. These differences are known as errors that need to be reduced or eliminated to maintain certain levels of accuracy. Even if you carefully follow the prescribed test procedures, the considerations may contain errors.