Abacus rods and telescope: what they have in common

1. Step 1. Abacus rods — is part of — Abacus. Guides for the beads.
2. Step 2. Abacus — is a kind of — Computing device. A counting tool.
3. Step 3. Computing device — includes — Antikythera mechanism. An analogue computing device.
4. Step 4. Antikythera mechanism — works like — Orrery. Mechanical models of celestial motions.
5. Step 5. Orrery — uses — Heliocentric system. The Copernican model.
6. Step 6. Heliocentric system — uses — Telescope. Galileo’s confirmations.

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