Grand Canyon National Park: Annular Eclipse Viewing 2012. . On Sunday, May 20, 2012 during the Annular Eclipse of the Sun NASA scientists, amateur astronomers, and the National Park Service teamed up to share their telescopes and knowledge with park visitors. The eclipse was followed by an evening South Rim Star Party. NPS Photo at Yavapai Point by Erin Whittaker.. . At Grand Canyon, observers saw the moon pass fully over the sun, leaving only a ring of sun visible around it. On both rims, at posted locations rangers used pinhole cameras and/or "solar projection" to show additional images of the eclipsed sun. . . This was the Timing of the eclipse at Grand Canyon:. . o 5:28 p.m. - partial eclipse begins. . o 6:34 p.m. - annular eclipse begins. . o 6:39 p.m. - annular eclipse ends. .