Solarium Augustiとは 意味・読み方・使い方

The Solarium Augusti, the largest sundial the ancient world has known, was erected in Rome by Emperor Augustus, with a 30-metre Egyptian red granite obelisk that he had imported from Heliopolis. In a triumphant demonstration of Ptolemaic Egypt's subordination to Roman military might the obelisk was employed as a gnomon that cast its shadow on a marble pavement inlaid with a gilded bronze network of lines, by which it was possible to read the time of day according to the season of the year. The solarium was dedicated to the Sun in 10 BC, shortly after Julius Caesar's calendar reform. It was the first solar dedication in Rome.