Armillary rings and cannon: 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 — Tailor’s tape. A scale is marked on the tape.
4. Step 4. Tailor’s tape — is made of — Linen. A tailor’s tape is a linen strip.
5. Step 5. Linen — is material for — Galleon. The sails were linen.
6. Step 6. Galleon — has part — Cannon. Cannons on the decks.

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