The Aztecs are at 1519 AD (5 o'clock). They are missing a piece from their Sun Stone. You can find it on Edison's roof at 1877 AD (9 o'clock). Push the button on the horseless carriage at left, and ride it to the tree at right.
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.
Keep going to the right.
inside a temple
In the Aztec period, you get them from the warrior.
It is on Time Tangled Island. You will get to it when you retrieve the golden stopwatch to travel in time.
To find Edmond's goggles (in the Aztec time).
he is under the temple (on the left) which has the sunstone
The sun stone in Time Tangled Island is located in the ancient city of Tenochtitlan, which corresponds to the Aztec civilization in Mesoamerica.
You only need to have the Warrior Headdress on to easily get past the Aztec guards and the goggles from the Aztec chief.
An Aztec warrior has it on him. You have to get the mask first, then talk to him and he should give it to you.
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 natives of mexico