A sundial is a time instrument
With the help of a sundial it is possible to designate the time by help of the sun. The oldest known sundial was found in Egypt and dates from around 1500 v. Chr. The Earth revolves around its axis, the shadow of an object therefore continually changes. When the shadow points north (in the southern hemisphere to the south) it is exactly noon. The sun then stands in the south, exactly above the meridian. From that point, you can create a distribution and Uurlijnen. A sundial can indicate the Babylonian hours (the number of hours elapsed since sunrise) or Italian hours (the number that has elapsed since sunset).
Making sundials [YouTube] 7uWb77jqRts [/youtube]