Shadows were photographed in a wire-model greenhouse oriented in N-S, E-W, and NE to SW (45°) directions in a heliodon which simulated 39° N latitude. Photographs were taken at 2 hr intervals during morning hours of winter and summer solstices. E-W greenhouses cast fewer shadows than other orientations during the winter solstice. Similar amounts of shadows occurred in all orientations during the summer solstice.
Received for publication July 13, 1970. Contribution No. 468, Department of Horticulture and Forestry, Kansas Agricultural Experiment Station.
Assistant Professor of Floriculture and Undergraduate Student, respectively. The authors are grateful to the Department of Architecture, Kansas State University, for use of the heliodon.