Abstract
A well-known navigational method is to determine position through observation of the highest altitude of the Sun at noon. This procedure is based tacitly on the assumption that the observed altitude is a symmetrical function of time about the highest point which appears thus in the meridian. In order to examine the accuracy of this approximation for a fast moving ship, let us consider the situation in more detail. The equations will be formulated using the standard functions in a modern pocket calculator and its application modules.
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