In 1995 PSL built the Wisconsin H-alpha Mapper (WHAM) telescope for the UW-Madison Space Physics Program. The telescope is designed to map the density and motion of ionized hydrogen in the galaxy. Because it is significantly larger than the previous telescope, WHAM was able to map the entire northern hemisphere within three years. PSL designed and built the siderostat, which includes the light-collection casing, the mechanics and electronics for rotation, and the software allowing the siderostat to interact with the control panel.

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