Calendar and solar panel: 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 — has part — Clock dial. A marked plane with hour lines.
3. Step 3. Clock dial — is part of — Tower clock. Large dials on the faces of the tower.
4. Step 4. Tower clock — is part of — Gothic cathedral. A tower clock.
5. Step 5. Gothic cathedral — has part — Window glass. Stained glass.
6. Step 6. Window glass — is part of — Solar panel. Tempered cover glass.

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