A 2100+ year old Greek astronomy machine worked, according to Live Science.

It could predict solar and lunar eclipses. It mechanically replicated the irregular motions of the moon.

Previous reconstructions suggested the Antikythera Mechanism was about the size of a shoebox, with dials on the outside and a complex assembly of bronze gear wheels within. By winding a knob on its side, the positions of the sun, Moon, Mercury and Venus could be determined for any chosen date. Newly revealed inscriptions also appear to confirm previous speculations that the device could also calculate the positions of Mars, Jupiter and Saturn—the other planets known at the time.

In 150 BC this machine worked.

I wonder if I can borrow it for my second book? The wonders of the ancient world. Why would Dielli encounter it and what would she think?