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Shepherd's Dial
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''. 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 very popular in the 16th, 17th, and 18th centuries. History Since the ancient Roman era, people have created sundials which tell the time by measuring differences in the sun's height above the horizon over the course of the day – Vitruvius describes them as . The earliest description of a shepherd's dial as known today was written by Hermann of Reichenau, an 11th-century Benedictine monk, who called it a . It was also known in the Middle Ages as a (Oxford cylinder). Such sundials did not need aligning north-south and so became very popular, appearing in Renaissance artworks such as Holbein's 1528 '' Portrait of Nicolaus Kratzer'' and h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tiempo Solar
Tiempo may refer to: Music * ''Tiempo'' (album), a 2003 album by Erreway * "Tiempo" (Cetu Javu song) (1994) * "Tiempo" (Erreway song) (2003) Other uses * ''Tiempo'' (magazine), a Spanish-language weekly * Tiempo (programme), a programme relating to global warming People with the surname * César Tiempo, (1906–1980), Russian-born screenwriter of Argentine cinema * Edilberto K. Tiempo (1913–1996), Filipino writer and professor, husband of Edith * Edith Tiempo (1919–2011), Filipina writer, wife of Edilberto * Rowena Tiempo Torrevillas (born 1951), Filipina poet, fiction writer and essayist, daughter of Edilberto and Edith * Sergio Tiempo (born 1972), Argentine classical pianist See also * A Tiempo (other) * El Tiempo (other) * ''Mi tiempo'', a 2007 album by Chayanne * Nike Tiempo, a sports brand * Nuevo Tiempo, a Spanish-language Christian TV and radio station for Central and South America * Tempo (other) Tempo is the speed or pace of a musical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gnomon
A gnomon (; ) is the part of a sundial that casts a shadow. The term is used for a variety of purposes in mathematics and other fields. History A painted stick dating from 2300 BC that was excavated at the astronomical site of Taosi is the oldest gnomon known in China. The gnomon was widely used in ancient China from the second century BC onward in order to determine the changes in seasons, orientation, and geographical latitude. The ancient Chinese used shadow measurements for creating calendars that are mentioned in several ancient texts. According to the collection of Zhou Chinese poetic anthologies ''Classic of Poetry'', one of the distant ancestors of King Wen of the Zhou dynasty used to measure gnomon shadow lengths to determine the orientation around the 14th century BC. The ancient Greek philosopher Anaximander (610–546 BC) is credited with introducing this Babylonian instrument to the Ancient Greeks. The ancient Greek mathematician and astronomer Oenopides used the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
