Practical information Introduction Set up a dial Finding your latitude and longitude Mottoes Frequent questions 6 projects to do Mass dials Bevezetés a Napórákhoz (HU) Come preparare una meridiana (I) 6 candrans solaires à faire (FR) Types of sundials Types de cadrans solaires(F) Tipos de relógios solares(P) Types Zonnewijzers (NL) Other languages Czech deutsch français magyar italiano nederlands portugues español Can you help translate some more pages?
A sundial shows the current solar time during the day. It does this because the sun appears to move through the sky. At different times in the day when the sun is shining, a shadow is cast in different places on the dial. A person marks the dial with the time at a certain shadow.
The Sun is highest in the sky at midday and casts a short shadow. In the afternoon, when the Sun is lower in the sky, the shadow is longer. The length of the shadow is also affected by the seasons. Winter shadows are longer than Summer shadows.
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HartRAO Home > Things to do > Make your own Sundial The type of sundial shown here is very easy to make - simply print out the one for your area!The sundial shown below is accurate to within five to ten minutes for places within the province of Gauteng in South Africa, such as Johannesburg or Pretoria.
Using our simple template, some tape, and a pencil, you can easily make a sundial good enough to keep track of the daytime hours. Learning how to make a sundial provides you with an amazingly simple yet effective devices. They range from sticks planted in the ground to precision-machined marvels costing thousands of dollars.
Related HowStuffWorks Articles More Great Links Sources "A Walk Through Time." National Institute of Standards and Technology Physics Laboratory. (1/5/2009) http://physics.nist.gov/GenInt/Time/ancient.html "Biological Clock of Honey Bees More Similar to Humans Than to Insects." Science Daily. 10/26/2006. (12/29/2008)http://www.sciencedaily.com/releases/2006/10/061025185102.htm Chaisson, Eric and McMillian, Steve. "Astronomy Today." Prentice Hall. 1999. (1/5/2009) "Circadian Rhythms." Encyclopedia Britannica.
A is a device that measures time by using a light spot or shadow cast by the position of the Sun on a reference scale. As the earth turns on its polar axis, the sun appears to cross the sky from east to west, rising at sun-rise from beneath the horizon to a zenith at mid-day and falling again behind the horizon at sunset.
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