You find it at 1877 AD (Thomas Edison). You push the red button on the motor wagon and hop on. Next, you climb the tree, once you get to the top, go onto the roof. You will find the sun piece on the 1st chimney (from the left).
Return it to 1519 AD.
The Aztec Empire is where you get the sun stone piece on Time Tangled Island. It is 1519 AD the picture is a man with headdress.
The colorful piece of stone (part of the Aztec Sun Stone) is on top of Edison's house (1877 AD). Return it to 1519 AD.
The piece of the Sun Stone is from the Aztec kingdom at 1519 AD (5 o'clock on the time device).
The sun stone in Time Tangled Island is located in the ancient city of Tenochtitlan, which corresponds to the Aztec civilization in Mesoamerica.
It is part of the Aztec Sun Stone (1519 AD). Take it there and return it. If you get the warrior mask from the far right, the guard will give you the Climbing Goggles for 1953 AD.
The piece of the Sun Stone for the Aztecs in Time Tangled Island can be found in the past, in the Aztec Empire. You'll need to use a grappling hook to climb to the top of the Temple of the Sun and retrieve the piece from there.
It's on top of Edison's roof in 1882 AD, where you return the phonograph. Bring it to the king at the Aztec time, 1519 AD.
It isn't necessarily gold, just a brightly colored piece of the Aztec Sun Stone. At 1877 AD, click to start the engine of the early motorcar, and it will drive to the right, under the tree. Climb the tree and onto the roof of Edison's house to find the sun stone piece in a chimney (one of two). Return it to 1519 AD.
The Aztecs (5 o'clock 1519 AD) are missing a piece of the Sun Stone. It is in one of the chimneys at Thomas Edison's house (9 o'clock, 1877 AD). Go left to the horseless carriage and start it, and ride it to the tree, to reach the roof. The stone is in the second chimney. Return it to the rulers at the Aztec pyramid in 1519 AD.
It's on top of the house of the guy who makes the telegram, sticking out of the chimney.
The Aztecs are at 1519 AD (5 o'clock on the time device). They are missing their Sun Stone piece (at 1877 AD). The hostile guard has the Climbing Goggles for 1953 AD. (Get the warrior mask at far right.)
Keep traveling and get stuff from people and look above every building possible.