->Sundials
By Wikipedia:
A sundial is a device that measures time by the position of the Sun. The most commonly seen designs, such as the 'ordinary' or standard garden sundial, cast a shadow on a flat surface marked with the hours of the day. As the position of the sun changes, the time indicated by the shadow changes. However, sundials can be designed for any surface where a fixed object casts a predictable shadow.
Da Wikipedia:
La meridiana è un antico strumento di misurazione del tempo basato sul rilevamento della posizione del Sole.
L'ago della meridiana, detto propriamente gnomone, è l'asta che, tramite l'ombra proiettata sul piatto della meridiana, permette l'indicazione dell'ora.
4 commenti:
I never knew these facts!
And these sundials have lovely faces.
Mari-Nanci
I didn't know there were square sun dials too. WOW!
No batteries! How beautiful.
The jigsaw puzzle one is my favorite!
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