Archive for November, 2009
What is the priciple behind the sundial?
Sundial is a home made object use as a clock using the shadow
. . . cast by the sun that indicate the time of the day, in some
.. . . extent the day and the month of the year.
Earth rotates around its axis 24 hours in a day
It seems that the sun is the one rotating around the earth.
The sun is seems to rotate around the earth’s axis.
Make a sun dial or make the axis of sun dial parallel to the axis of the earth.
why not put this question in Math
Antique Clocks : Original Antique Clocks
Original antique clocks included sundials and water clocks. Learn the original clocks with tips from a clock repairman and collector in this free video on antique collecting.
Expert: Bob Frishman
Bio: Bob Frishman is the owner of Bell-Time Clocks, and he has collected and repaired clocks since 1980.
Filmmaker: Christian Munoz-Donoso
Duration : 0:2:4