More than ever, solar energy is proving to be a viable, safe, abundant source of renewable energy to help meet today's energy requirements around the world. At the core of just about all solar energy research, whether for site planning, or real time aiming of the most sophisticated concentrating receivers, heliostats, and photovoltaic tracking systems, is the need to know exactly where the sun is in the sky, at any given time and at any given location on the earth. The intent of this book is to meet that need more efficiently and with better usability than just about any resource available. The Algorithms are written in 9 common programming languages. The languages are: C language source code C# (C-Sharp) source code Excel VBA source code Fortran source code Java source code Javascript source code PHP source code Python source code VB (Visual Basic) source code