This study intends to measure the daylight performance in atria and in the spaces adjacent to atria under exclusively clear sky conditions. It also illustrates the quantitative and qualitative available light in all orientations using physical models. A geometry of 1:1:2 for the atria was used. It was found that an atrium with the same geometry provides sufficient illumination for the upper half portion of the spaces adjacent to atria, and a low illumination level for the bottom half of the adjacent spaces. It was further found that the physical model showed that the points immediately adjacent to the rear wall (2 ft from the rear wall) in the adjacent spaces receive more illumination than the points 5 ft from the rear walls.