We have created several versions of this exhibit. With a fixed “Sun” and an earth that can both rotate on axis and change angle in relation to the sun we can model the effects of the seasons as an orrery would but with a much smaller footprint. And visitors can study the effects close up. In one version of this exhibit we use photocells in several locations on the globe to track, using needle meters, the intensity and phase of the light. Effects such as the more varied seasonal changes in higher latitudes, and the time difference between locations of different longitude, are intuitively
