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A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the dial) and a gnomon, which casts a shadow onto the dial.
The ancient Greeks developed many of the principles and forms of the sundial. Sundials are believed to have been introduced into Greece by Anaximander of Miletus, c. 560 BCE. According to Herodotus, Greek sundials were initially derived from their Babylonian counterparts.
sundial, the earliest type of timekeeping device, which indicates the time of day by the position of the shadow of some object exposed to the sun’s rays. As the day progresses, the sun moves across the sky, causing the shadow of the object to move and indicating the passage of time.
6 de may. de 2022 · How do sundials work? Let's take a close look at our school sundial.
28 de mar. de 2020 · Archaeologists have found two miniature stone engravings in a cave on the island of Sulawesi in Indonesia. One plaquette appears to be a sunburst, the other an ibex like animal, the anoa. These pocket-sized carvings dating back between 14,000 and 26,000 years. Elsewhere in Sulawesi the oldest cave art dating to 44,000 years ago was recently ...
9 de nov. de 2017 · A 2,000-year-old intact and inscribed sundial – one of only a handful known to have survived – has been recovered during the excavation of a roofed theatre in the Roman town of Interamna Lirenas, near Monte Cassino, in Italy. Not only has the sundial survived largely undamaged for more than two millennia, but the presence of two ...
In Ye Sundial Booke by T. Geoffrey W. Henslow in 1914, there are two sketches, one showing the sundial pillar at Abbotsford, Scotland, and the other depicting the replica sundial at Hillside. Lastly, in The Book of Sun-Dials , the author Margaret Gatty apparently made her sketch of the sundial pillar at Abbotsford in 1839, but, by then, the sundial was missing — more than likely stolen.
