Balestilha e screw press: o que têm em comum

1. Passo 1. Balestilha — utiliza — Trigonometry. The altitude of a celestial body is found from an angle.
2. Passo 2. Trigonometry — é utilizado em — Sextant. Navigational calculations.
3. Passo 3. Sextant — faz parte de — Sailing ship. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
4. Passo 4. Sailing ship — utiliza — Mercator projection. Navigating along straight rhumb lines.
5. Passo 5. Mercator projection — utiliza — Gutenberg printing press. Maps were printed in large numbers.
6. Passo 6. Gutenberg printing press — tem como parte — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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