  the hobbyâeberly telescope is a 9.2-meter (30-foot) aperture telescope located at the mcdonald observatory. it combines a number of features that differentiate it from most telescope designs, resulting in greatly lowered construction costs. for instance, the primary mirror is constructed from 91 hexagonal elements, which is less expensive than manufacturing a single large primary. furthermore the telescope's main mirror is fixed at an 55 degrees angle and can rotate around its base. a target is tracked by moving the instruments at the focus of the telescope; this allows access to about 70â81% of the sky at its location and a single target can be tracked for up to two hours. the telescope is named for former texas lieutenant-governor bill hobby and for robert e. eberly, a penn state bene
Telescopes University_of_Texas_at_Austin