babylonian civilization - 4lecours class...
TRANSCRIPT
Arko bagchiBabylonian Civilization
Sundial
A sundial is a device that tells the time of day by the position of the sun 3500 BC.
How is it made? Parts of A Sundial
•Gnomon: The shadow caster, in a horizontial dial the angle phi is equal to the Latitude of the location.
•Hour Line(s): The numbered lines that the shadow falls along.•Nodus: A "marker" along the gnomon to get an exact point on the
shadow.•Furniture: Lines and "functions" other than the Hour lines, usually date
lines (this is what the nodus is for).
Sundials- Working
Sunlight & Sundial
6am
8am
9am
12am2pm 10am
3pm
4pm
7pm
Looking North, the Sun appears to rise in the East...
...and travel across the sky until it sets in the West.
The position of the Sun effects the position and length of the shadows created.
Thanks to this natural phenomenon a sundial is able to tell time, as discovered by the Babylonians!!
Concrete
Metal
Stone
Wood
How telling Time Changed With
Time!
candle clock
lamp clock
sand hour glass
greek water clock
austrian wall clock
box chronograph
modern desk clock
time piece
modern wrist watch
sundial
Classified by the plane in which the dial lies, as follows:
Horizontal dials
Types of Sundials
Vertical dials
Equatorial dials Polar dials
Analemmatic Sundial: sundials consisting of hour points (rather than hour lines)
Reflected ceiling dials portable dials
Even today sundials act as artifacts and are of interest to many and even mathematicians use them for various
experiments and calculations.
Thank you !