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en.wikipedia.org/wiki/History_of_sundials

History of sundials Jump to ... Before the invention of the clock the sundial was the only source of time, after the invention, the sundial became more important as the clock needed to be reset regularly from a sundial- as its accuracy was poor. ... Sundials: History, Theory, and Practice ...

www.britannica.com/technology/sundial

sundial Animation of a sundial. Before clocks were invented, people generally relied on the passage of the sun through the sky to tell time. One of the most important early devices for telling time was the sundial. Click on the arrow in the illustration to see an animation of how the sun's position in the sky was used to mark the daylight hours.

www.timecenter.com/articles/when-time-began-the-history-and-science-of-sundials

NASS: Official site of the North American Sundial Society with links to publications, conferences, construction, and more. Frans Maes: A site with gallery of over 200 sundial pictures. Sun Clocks: Provides information on sundials covering their workings and history. How Sundials Work: Shows how sundials work with diagrams and concise descriptions.

www.historyofwatch.com/clock-history/history-of-sundials

The most famous example of sundial innovation came from mathematician and astronomer Theodosius of Bithynia (160 BC - 100 BC) who claimed to have invented universal sundial that can be used anywhere in the world. Sundial advances that were made in Greece quickly traveled to Rome, who made their first sundial in Rome in 293BC.

www.reference.com/history/invented-first-sundial-c7e246e7e895f187

The first sundials were built by the Egyptians and the Babylonians. These sundials date as far back as 5,000 BC. However, the first evidently purpose-built sundial was not constructed until 800 BC. The obelisks built by the Egyptians and the Babylonians served more than their decorative purpose. They used the position of the shadow to estimate ...

electronics.howstuffworks.com/.../ancient-civilizations-use-sundials1.htm

Taking the first of these two facts in hand, we find that the time given by a sundial (known sometimes as solar time or sun time) often differs from the time you'll read on your wristwatch (which can be called clock time or mean solar time).The variance can be up to about 15 minutes at different times throughout the year.

en.wikipedia.org/wiki/Sundial

A sundial is a device that tells the time of day when there is sunlight 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. As the Sun appears to move across the sky, the shadow aligns with different hour-lines, which are marked on the dial to indicate the time of day.

www.sundial.net/sundial-history.html

History of the Sundial. It is not known when the sundial was invented, or what people invented it. Sundials can be found in many ancient civilizations, including the Babylonian, Greek, Egyptian, and Roman ages. The oldest record of the sundial can be found in the Bible as it is alluded to in Job 7:2 "as a servant earnestly desireth the shadow ...

www.answers.com/Q/When_was_the_first_sundial_invented

It is thought that the first sundial was invented by the Ancient Romans in 440 B.C approx. The inventor of said sundial cannot be determined, but it is thought that the inventor was that of ...

www.thoughtco.com/history-of-sun-clocks-4078627

The hemicycle, said to have been invented around 300 BCE, removed the useless half of the hemisphere to give an appearance of a half-bowl cut into the edge of a square block. By 30 BCE, Roman architect Marcus Vitruvius could describe 13 different sundial styles in use in Greece, Asia Minor, and Italy.