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For more sundials, we suggest:

History of sundials
No one is sure when the first sundial was
constructed. The Egyptians about 1500BC constructed step
Sundials and some of them even accounted for the change
in the length of the day. And in 3100BC on Salisbury
plains in England a monument called Stonehenge was built
(which took over 500 years to build) which traces the
movement of the sun over an year.
In 1728 Jantar Mantar, an astronomical observatory
was built in the city of Jaipur, India. It has a sundial
with a 30 metre high gnomon.
Before the modern clock, people often carved sundials
into buildings. In many historic farmhouses, one can
often find a line carved into something like the window
sill, a wall, or a floor. This mark was called the noon
mark, and was used to indicate the time of local noon.
These days, the need for sundials has of course
diminished. Thanks to accurate watches, there is no need
to carry around a pocket-sized sundial. Nevertheless,
sundials should not be forgotten. They are still one of
the most reliable forms of timepieces available, for the
sun will always rise in the morning and set in the
evening.
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