McMath Solar Telescope

McMath Solar Telescope

. A moveable heliostat, perched atop this telescope, follows the Sun and directs its light downward through the long fixed shaft of the telescope. A figured mirror at the bottom reflects and focuses the sunlight toward the observation room. The shaft’s axis is parallel to the rotation axis of the Earth, and about three-fifths of it is underground. It is kept cool by pumping cold water through tubes in the exterior skin, thereby reducing turbulence in the air inside and keeping the Sun’s image steady.

Copyright 2010, Professor Kenneth R. Lang, Tufts University