Calendar and shaduf: what they have in common

1. Step 1. Calendar — uses — Sundial. Calendar observations relied on the movement of the gnomon’s shadow.
2. Step 2. Sundial — is made of — Stone. Sundials were hewn from stone.
3. Step 3. Stone — is material for — Well. The walls of wells were lined with stone.
4. Step 4. Well — uses — Shaduf. Or with a well sweep.

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