Armillary rings and computer: what they have in common

1. Step 1. Armillary rings — is part of — Armillary sphere. The equator, ecliptic and meridian.
2. Step 2. Armillary sphere — uses — Euclidean geometry. The rings model the celestial circles.
3. Step 3. Euclidean geometry — is used in — Weather station. Instruments are set up on a site according to a standard.
4. Step 4. Weather station — is used in — Weather forecast. Observations.
5. Step 5. Weather forecast — uses — Supercomputer. Numerical forecasting.
6. Step 6. Supercomputer — is a kind of — Computer. A computer.

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