Five algorithms for sun position computation, with validity from 2010 to 2110, are proposed and discussed. The algorithms have different accuracy levels, with maximum errors in the solar position spanning from 0.19 degrees to 0.0027 degrees, thus covering a wide range of possible applications. The algorithms are optimized in order to reduce their computational cost as much as possible. The extended time range of validity allows users to employ these algorithms even in long-term projects. (C) 2012 Elsevier Ltd. All rights reserved.