Rotunda

“Daylight is admitted to the Rotunda dome room through a central overhead oculus and 14 double hung windows around the perimeter.

The conical skylight, 16 feet in diameter, admits daylight uniformly from all directions of the sky dome. The 7 foot by 4 foot clear glazed windows (85% transmission) create a perimeter zone of daylight under the circular gallery. However, the daylighting conditions in this perimeter zone are not uniform due to porticos at the north and south sides which shade the windows, fireplaces in lieu of windows on the east and west sides and trees of varied size and spacing which obstruct the daylight.

The windows are placed on 18 degree radii and set within deep splayed recesses 0f 68% reflectance. The dome lined, with white metal acoustical panels, has a reflectance of 62% and the heart pine floor has a reflectance of 28%.”

http://cassidywolfe.wordpress.com/page/2/

http://www.arch.virginia.edu/archive/ded7y/vs98/RCstudy1.htm