Abstract: Based on spherical astronomy, this paper deals with the establishment of a simple mathematical model, and complicated calculation of solar apparent coordinate, and it is also concerned with a simple convenient multifunction program designed and developed by the calculation of the solar apparent coordinate suitable for a computer or program calculator on the basis of general engineering requirement and survey theory. The use of the calculating procedure can perform calculation of the geographical coordinate and direct and invert calculation of the shadow’ s length and the height of an object. This method has the advantage of both convenience and exactness and the practical value as well.