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A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the dial ) and a gnomon , which casts a shadow onto the dial.
Be as true to each other as this dial is to the sun. Begone about Thy business. Come along and grow old with me; the best is yet to be. [1] Hours fly, Flowers die. New days, New ways, Pass by. Love stays. [2] Hours fly, Flowers bloom and die. Old days, Old ways pass. Love stays. I only tell of sunny hours. I count only sunny hours.
The declination of the sun (determines the daily gnomon position). Analemmatic sundials are sometimes designed with a human as the gnomon. In this case the size of the hour marker ellipse is constrained by human height and the latitude of the sundial location, since the human gnomon shadow must fall on the hour marker ellipse to accurately ...
Noon in local standard time is defined as when the sun is overhead, however clocks and watches use mean time which varies from standard time by a few minutes each day. The difference is calculated using the equation of time and this can be shown on the noon mark by drawing an analemma , or using a correction table.
A shepherd's dial (also known as a pillar dial or cylinder) is a type of sundial that measures the height of the sun via the so-called umbra versa. [1] Its design needs to incorporate a fixed latitude, but it is small and portable. It is named after Pyrenean shepherds, who would trace such a sundial on their staffs. This type of sundial was ...
A digital sundial is a clock that indicates the current time with numerals formed by the sunlight striking it. Like a classical sundial, the device contains no moving parts. It uses no electricity nor other manufactured sources of energy. The digital display changes as the sun advances in its daily course.
A sundial displays the local apparent time, and watches that use mean time or average time will always be at a slight variance. This difference of time can be calculated and displayed on the dial – again using old language it is known as the equation of time .
Obelisk of Pharao Psamtik II, now called "Obelisk of Montecitorio", used as a Roman sundial, the famous Horologium Augusti, in Rome. In the background is the Italian Chamber of Deputies building [5] In 10 BCE, Emperor Augustus ordered this and the Flaminio Obelisk to be brought to Rome. [6]