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How to make a sundial

Sundials are seemingly simple time-measuring instruments, but it is not an easy task to build an accurate one.

9 – 12. razred

Autor: Kovács Attila

Ocjenjivač: Csányi Sándor

Grafičar: Molnár Mónika

Developer: Gálea Patrik, Jeszenszky Anna

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