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Sundials

Sundials. How does it work?. The Sun appears The sun makes shadow of sundial stick. history.

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Sundials

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  1. Sundials

  2. How does it work? • The Sun appears • The sun makes shadow of sundial stick

  3. history • The difference between the dark nights and the daylight was probably the first division of time recognized by early peoples. They would also have noticed that the sun came up over the eastern horizon and went down again below the western horizon bringing darkness to their world. • During the day they saw that the shadow cast by a tree, a rock, or even their own body was long early in the morning and grew shorter and shorter until it disappeared when the sun was overhead in the middle of the day. They also would have noticed that the shadow grew longer again, on the other side of the tree, as night came.After awhile they were able to tell how much of the day was over by looking at the shadows. The first timepiece was probably invented by a person who put a stick in the ground and made marks in the dirt to show where the stick's shadow was every hour.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.

  4. example • The ancient Egyptians built tall stone towers called obelisks. Everybody could tell the time by looking at the obelisk's shadow. Obelisks were sometimes called "Cleopatra's Needles

  5. It is one kind of sundial. everybody who wants to know time they can come, and look

  6. This is a portable ivory sundial, made in Germany in 1635 by Leon hart Miller.It is aligned using a compass on the base and the time is read off from the shadow cast by the string. The underside of the base has a moon dial which converts the time shown on the main dial if used for the moon at night. The lid also has a compass that can be used for orienteering.

  7. Cubic sundial • These many-faced dials were a way for a sundial maker to show off their skill. The aim was to make a multi-faced dial so that each face would show the correct time. It was aligned using the compass on the base. • It was made by David Beringer in 1800 in Nuremburg.

  8. Ring dial, Cadot, 1680, French • This is a pocket sundial. It is read by allowing the Sun to shine through the gap in the central sliding band. It was made in France in around 1680 by a sundial specialist, Cadot.

  9. In conclusion • There are so many ways to know time, And judging by it we can understand that time is very important in our life. And we want to say: save time, try to live interesting life in order to not regret. Because nobody can return time back

  10. recources • http://www.fi.edu • http://www.liverpoolmuseums.org.uk • http://www.sundialsculptures.com/gallery/

  11. THANKS FOR ATTENTION

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