We were camping at the edge of the ansel Adams wilderness checking the sky for satellites. We saw a faint light coming our way from the east. The light then gradually became much brighter and passed over us and disappeared over the mountain to the west. We were discussing what we saw, only about thirty seconds later, when it came back from the west, and headed east again. It grew very bright, then faded to dim, to bright again, then faded so dim we could not see it. It made no noise.