The Sun Shrine (also known as Sun Keep in the SNES/PS version) (大陽神殿 "Taiyō Shinden" literally "Great Sun Temple") is a location in Chrono Trigger that appears in all time eras. The Sun Temple plays a role during an optional part of the game. If the heroes acquire the Moon Stone, it can be recharged here.
The Sun Temple is a small cave located on the North-eastern section of all maps. Inside, there is a small set of stairs leading to a pedestal bathed in light. The interior indicates there is a small hole that allows sunlight inside.