Sundials are timepieces that use the position of the sun to indicate the time of day. Sundials were invented by ancient Egyptians. Some Egyptian sundials have been found that date to about 3500 BCE. The history of sundials also includes their use by later civilizations, such as the Greeks and Romans.
Sundials consist of two parts: a dial face, or base and a gnomon, which is the part in the middle that casts the shadow onto the Best roti maker base. The base will have markings all around it to indicate the hours of the day. When the sun hits the gnomon, the gnomon will cast a shadow onto the base. The hour mark that the shadow falls on will indicate the correct time.
In order for a sundial to work properly, it should be installed at the latitude it is designed for. However, most sundials may work at any latitude simply by tilting them to a different angle. Sundials can even take daylight savings time into account if necessary, by having a second set of markings on the base, or through the use of a correction chart. Solar time, which a sundial tells, differs from clock time by approximately 15 minutes over the course of a year. However, there are charts that come with many good sundials that can be used to correct this difference.
Sundials can be mounted at an angle, like traditional sundials of ancient cultures, mounted parallel to the ground, like garden sundials, or even vertically mounted, as on the side of a building. Another type of sundial, called a polar sundial, must be installed at an angle to match that of the Earth’s polar axis, and the base must be aligned in an east-to-west direction. Each version has its own advantages and drawbacks. For example, the garden sundial can keep time all day long, since it will never be in the shadows like a traditional sundial would be. But a working knowledge of trigonometry is required to construct a garden sundial, so it is a bit more difficult. Sundial watches are also available, but require the user to stand facing in one direction and with the gnomon pointing in another, or the watch will not work.
There are many online websites that give directions on how to make a sundial. The sundials you can build range from simple to complex, and plain to ornate. The same wide variety is available in sundials that you can buy premade. The decision whether to build your own sundial or buy one is up to you. Either way, you will easily find a sundial that best suits your needs.