Welcome to Tuolumne Skies Observatory Tuolumne Skies Observatory is located at 3,500′ elevation in the Sierras of California, outside the town of Groveland on Route 120, 30 minutes west of Yosemite National Park. The facility has a three-story main observatory, and a second “Dall House” dome, together housing several telescopes on isolated fixed piers, organized for both CCD camera … Continue reading Home →