At this book the main focus is the point of giving examples to create an idea on the gap between advanced GIS technology and small apps on the field of geosciences. A small app used to calculate geodesic and cartographic data is the main content of the book. The project is realized with the help of Python 3X and Microsoft Visual Studio. Meanwhile the functions of the program include a full list of Ellipsoids used in our days, calculation of 11 formulas for ellipsoid parametres, getting distace or area by using different ellipsoids. For support to download or install the program contact here: [email protected]