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# Which period used sundial?

## Which period used sundial?

The mathematician and astronomer Theodosius of Bithynia ( c. 160 BC to c. 100 BC) is said to have invented a universal sundial that could be used anywhere on Earth. The Romans adopted the Greek sundials, and the first record of a sundial in Rome is 293 BC according to Pliny.

When was the sundial first used?

3500 BC
The earliest design of the sundial dates as far back as 3500 BC, where a simple stick wedged in the earth monitored the shadows of the passing day.

### When and where was the earliest sundial used?

The oldest known sundial was found in Egypt and dates from the time of Thutmose III, about 1,500 years BC. There were two strips of stone, one that did the needle and another where the hours were marked.

When and how a sundial is used?

The oldest known instrument for telling time, the sundial, allows us to track the position of the sun more accurately. Up until the early 19th century sundials were the main instrument people used to tell time. If they are correctly placed, sundials can be used to accurately tell time down to the minute!

#### Who established the 24 hour day?

Hipparchus, whose work primarily took place between 147 and 127 B.C., proposed dividing the day into 24 equinoctial hours, based on the 12 hours of daylight and 12 hours of darkness observed on equinox days.

Who made the first sundial?

The mathematician and astronomer Theodosius of Bithynia (c. 160 BCE to c. 100 BCE) is said to have invented a universal sundial that could be used anywhere on Earth. The Romans adopted the Greek sundials, and the first record of a sundial in Rome is 293 BCE according to Pliny .

## What is the earliest form of a sundial?

The shadow stick is the earliest form of sundial. People judged the time of day by the length and position of the stick’s shadow. As the Earth turns on its axis, the Sun appears to move across the sky. The shadows the Sun casts move in a clockwise direction for objects in the northern hemisphere.

When was the first sundial used?

The sundial dates back to the Egyptian Period, around 1500 B.C. It was also used in ancient Greece and Rome. In central Europe it was the most commonly used method to determine the time, even after the mechanical clock was developed in the 14th century.

### What is the oldest example of a sundial?

The oldest example is perhaps the antiborean sundial (antiboreum), a spherical nodus-based sundial that faces true North; a ray of sunlight enters from the South through a small hole located at the sphere’s pole and falls on the hour and date lines inscribed within the sphere, which resemble lines of longitude and latitude, respectively, on a globe.