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- Sun_clock abstract "The Sumerian culture was lost without passing on its knowledge, but the Egyptians were apparently the next to formally divide their day into parts something like our hours. Obelisks (slender, tapering, four-sided monuments) were built as early as 3500 BCE. Their moving shadows formed a kind of sundial, enabling people to partition the day into morning and afternoon. Obelisks also showed the year's longest and shortest days when the shadow at noon was the shortest or longest of the year. Later, additional markers around the base of the monument would indicate further subdivisions of time.Another Egyptian shadow clock or sundial, possibly the first portable timepiece, came into use around 1500 BCE. This device divided a sunlit day into 10 parts plus two "twilight hours" in the morning and evening. When the long stem with 5 variably spaced marks was oriented east and west in the morning, an elevated crossbar on the east end cast a moving shadow over the marks. At noon, the device was turned in the opposite direction to measure the afternoon "hours."The merkhet, the oldest known astronomical tool, was an Egyptian development of around 600 BCE. A pair of merkhets was used to establish a north-south line (or meridian) by aligning them with the Pole Star. They could then be used to mark off nighttime hours by determining when certain other stars crossed the meridian.In the quest for better year-round accuracy, sundials evolved from flat horizontal or vertical plates to more elaborate forms. One version was the hemispherical dial, a bowl-shaped depression cut into a block of stone, carrying a central vertical gnomon (pointer) and scribed with sets of hour lines for different seasons. The hemicycle, said to have been invented about 300 BCE, removed the useless half of the hemisphere to give an appearance of a half-bowl cut into the edge of a squared block. By 30 BCE, Vitruvius could describe 13 different sundial styles in use in Greece, Asia Minor, and Italy.".
- Sun_clock wikiPageExternalLink early.html.
- Sun_clock wikiPageID "25120004".
- Sun_clock wikiPageLength "2321".
- Sun_clock wikiPageOutDegree "11".
- Sun_clock wikiPageRevisionID "632817407".
- Sun_clock wikiPageWikiLink BCE.
- Sun_clock wikiPageWikiLink Category:Sundials.
- Sun_clock wikiPageWikiLink Common_Era.
- Sun_clock wikiPageWikiLink Gnomon.
- Sun_clock wikiPageWikiLink Hemicycle.
- Sun_clock wikiPageWikiLink Merkhet.
- Sun_clock wikiPageWikiLink Midsummer.
- Sun_clock wikiPageWikiLink Obelisk.
- Sun_clock wikiPageWikiLink Shadow_clock.
- Sun_clock wikiPageWikiLink Sundial.
- Sun_clock wikiPageWikiLink Vitruvius.
- Sun_clock wikiPageWikiLink Winter_solstice.
- Sun_clock wikiPageWikiLinkText "Sun clock".
- Sun_clock wikiPageWikiLinkText "sun clock".
- Sun_clock article "Earliest Clocks".
- Sun_clock hasPhotoCollection Sun_clock.
- Sun_clock url early.html.
- Sun_clock wikiPageUsesTemplate Template:NIST-PD.
- Sun_clock wikiPageUsesTemplate Template:Orphan.
- Sun_clock wikiPageUsesTemplate Template:Reflist.
- Sun_clock subject Category:Sundials.
- Sun_clock type Article.
- Sun_clock type Article.
- Sun_clock type Source.
- Sun_clock type Technology.
- Sun_clock comment "The Sumerian culture was lost without passing on its knowledge, but the Egyptians were apparently the next to formally divide their day into parts something like our hours. Obelisks (slender, tapering, four-sided monuments) were built as early as 3500 BCE. Their moving shadows formed a kind of sundial, enabling people to partition the day into morning and afternoon. Obelisks also showed the year's longest and shortest days when the shadow at noon was the shortest or longest of the year.".
- Sun_clock label "Sun clock".
- Sun_clock sameAs m.09glmg6.
- Sun_clock sameAs Q7638689.
- Sun_clock sameAs Q7638689.
- Sun_clock wasDerivedFrom Sun_clock?oldid=632817407.
- Sun_clock isPrimaryTopicOf Sun_clock.