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Transcript

What are sundials?

  • device that tells time
  • rise in the east and set in the west
  • depends on the rotation of the sun
  • clock and watches tell time

Did you know?

There are many types of sundials and some of them are

  • Horizontal dial
  • Vertical dials
  • Equatorial dials
  • Polar dials
  • Cylindrical dial
  • Spherical dial

Sundials were discovered outside a tomb in Egyptians valley of the kings

How sundials work?

  • shadow cast by gnomon changes levels from summer to winter
  • longer in winter when sun is low in the sky
  • often have 2 sets of numbers
  • inner set for summer, outer set for winter
  • shadow casted by gnomon longest at dawn and twilight

Introduction

Have you ever wondered how you keep track of time if sundials weren't invented if u haven't here is a quick presentation all about Egyptian Sundials.

Where were sundials made and used?

  • ancient Egypt
  • in the morning the pillar faces East
  • afternoon faces West

Who invented sundials?

  • invented by Egyptians and Babylonions
  • the egyptians built a T-shaped sundial
  • they used a stick or pillar called the gnomon

When time began?

The Egyptians depended not only for time,but also survival example the farmers needed to know when the season began to change

  • before the sundial there was nothing accurate thing to tell time
  • the time began 4.5 billion years ago

Sundials

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