This assignment was part of the Design Innovation Center project by Ministry of Human Resources Department to SPA Delhi. SPA is developing an innovative external moveable shading system (EMSS) for reducing solar discomfort in the various climatic region of India. The assignment intends to provide technical support for the prototype development for EMSS by identifying the critical solar angles that cause solar heat gain affecting thermal comfort in a building. The work will be accomplished through Python scripting in Grasshopper and modelling in Rhino.