58262ddggfgbjjkbvcxthnnknjnjgfdrdfjn92.ppt

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1. Sundial.

2. What is the Sundial?
A sundial is an
ancient invention
that tells time using
the sun’s position.
The gnomon is used
to show the sun’s
shadow.

3. History of the Sundial
The sundial dates back as far as Egyptian
and Babylonian times, around 1500 BC.
The Ancients Greeks then made sundials
their own. They are the ones that
developed the science of sundial.
The Romans then adopted the Greeks’
sundials. The first known Roman sundial is
from 293 BC.

4. How Does it Work?
By using the
shadow of the
sun, you can tell
the time of day.
When it’s midday
the shadows is
short.
When it’s
afternoon, the sun
casts a longer
shadow.
FUN FACTS!!!!
The shadow in
winter is longer
than the shadows
in summer. This is
because the sun is
lower in the sky in
winter.

5. Types of Sundials
Horizontal dials
Vertical dials
Equatorial dials
Polar dials
Reflected ceiling
dials
Portable dials
Analemmatic
dials
The sundial that is
most know is the
horizontal dial. It’s
design is made on
a pedestal. The
horizontal dial is
one that is
commonly seen
today