During the Neoproterozoic period, most land-masses were assembled into the super-continent, Rodinia, and parts experienced glaciation in low paleolatitudes. We examine possible causes of glaciation by increasing rotation rate, reducing the solar constant and carbon dioxide concentrations for an idealized super-continent that is centered in the Northern Hemisphere tropics-subtropics. Further, we introduce a 2 km north-south mountain chain in the western regions of this super-continent. A mixed layer ocean or prescribed time varying sea surface temperatures are used in these simulations. Our results show that neither an individual factor or a combination of these factors can cool temperatures enough to bring about glaciation on the tropical super-continent. We conclude that other factors would be needed to initiate glaciation. ¿ 1998 American Geophysical Union