History of Sundial A sundial is a device that measures time by the position of the sun Used to tell time up until the 1800s Archaeological finds discover shadow clocks in 1500 BCE in Egypt ID: 415949
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SundialsSlide2
History of Sundial
A sundial is a device that measures time by the position of the sun.
Used to tell time up until the 1800’s
Archaeological finds discover “shadow clocks” in 1500 B.C.E. in Egypt.
Used by prominent civilizations through ancient history to tell time.Slide3
How sundials work
In most designs a sundial consist of two parts; the gnomon and the dial. The gnomon usually a triangle in shape is placed in the middle of the dial facing as close to True North as possible for best accuracy. All dials are constructed differently based on what latitude you are located. This is done by adjusting how close or far the time lines are upon the dial. As the sun rises it will cast a shadow across the gnomon and project it upon the dial the point of this shadow on the dial best describes the time of day. Slide4
Assignment
With your mentors you will construct a sundial and proceed outside and record your findings with in a hour of accuracy.
These materials will be provided:
construction
paper
scissors
drinking straws
glue
cardboard
sunny day
sundial template