Quadrante de Davis e mechanical clock: o que têm em comum

1. Passo 1. Quadrante de Davis — utiliza — Trigonometry. The Sun’s altitude is found from the angle of a shadow.
2. Passo 2. Trigonometry — evoluiu de — Euclidean geometry. A development of geometry.
3. Passo 3. Euclidean geometry — é utilizado em — Sundial. The scale is marked by the angle of the shadow.
4. Passo 4. Sundial — funciona como — Water clock (clepsydra). Two ancient ways to measure time: by a shadow and by flowing water.
5. Passo 5. Water clock (clepsydra) — evoluiu para — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

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