As the sun moved across the sky above, the shadow of the gnomon or pin would trace the reverse of its course through the inscriptions on the curve below. The hemispherium was carved out of a block of ...

Otherwise referred to as a shadow clock, a sundial was how ancient civilisations determined the time of day. The horological ...

This is a horizontal compass sundial, made of gilded silver. It is of 'Butterfield' type, named after English manufacturer Michael Butterfield, who popularised the adjustable bird gnomon.

The seven vertical lines represented the 14 hours of the day during which the sun was up. The horizontal lines measured the length of the shadow of the gnomon. The 13 horizontal lines read the 24 ...