首页
登录
职称英语
[originaltext] Not until somewhat recently(that is, in terms of human histor
[originaltext] Not until somewhat recently(that is, in terms of human histor
游客
2024-02-16
8
管理
问题
Not until somewhat recently(that is, in terms of human history) did people find a need for knowing the time of day. As best we know, 5,000 to 6,000 years ago great civilizations in the Middle East and North Africa initiated clock-making. With their bureaucracies and formal religions, these cultures found a need to organize their time mom efficiently.
The Egyptians were 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 B.C. Their moving shadows formed a kind of sundial, enabling citizens to partition the day into two parts by indicating noon. They also showed the year’s longest and shortest days when the shadow at noon was the shortest or longest of the year. Later, markers added around the base of the monument would indicate further time subdivisions.
Another Egyptian shadow clock or sundial, possibly the first portable timepiece, came into use around 1500 B.C. to measure the passage of "hours". 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 east a moving shadow over the marks. At noon, the device was turned in the opposite direction to measure the afternoon "hours".
In the quest for more 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 B.C., removed the useless haft of the hemisphere to give an appearance of a half-bowl cut into the edge of a squared block.
选项
A、4,000-5,000.
B、50-60,000.
C、500-600.
D、5,000-6,000.
答案
D
解析
How many years ago did clock-making come into existence?
转载请注明原文地址:https://www.tihaiku.com/zcyy/3454930.html
相关试题推荐
[originaltext]AnorganizationbasedintheUnitedStateshonorspeoplewho,in
[originaltext]AnorganizationbasedintheUnitedStateshonorspeoplewho,in
[originaltext]MymotherwasborninasmalltowninnorthernItaly.Shewas
[originaltext]MymotherwasborninasmalltowninnorthernItaly.Shewas
[originaltext]W:Nextpatient,please!Comein.M:Morning,doctor.SorryI’ma
[originaltext]W:Nextpatient,please!Comein.M:Morning,doctor.SorryI’ma
[originaltext]W:Nextpatient,please!Comein.M:Morning,doctor.SorryI’ma
[originaltext]W:Excuseme,sir.I’mgoingtosendthisparceltoLondon.What’
[originaltext]W:Excuseme,sir.I’mgoingtosendthisparceltoLondon.What’
[originaltext]W:Excuseme,sir.I’mgoingtosendthisparceltoLondon.What’
随机试题
Before,wheneverwehadwealth,westarteddiscussingpoverty.Whynotnow?
【B1】[br]【B18】A、amongB、withC、toD、withinC此处表示与他人分享的意义。只有[C]with与动词搭配,其他选项都不符
有关结核病化疗原则的叙述错误的是()。A.应坚持早期、联用、足量、规律、全程
主流的网络存储方式中不包含的是()A.DAS B.SAN C.NAS
关于牙菌斑,下列哪一项叙述是正确的()A.龈上菌斑和龈下菌斑的细菌种
消防工程验收由( )组织,由( )主持,公安消防监督机构指挥。 A、监理单位
房地产项目在销售前,需要对售楼处、样板房等进行()。A.突出功能优势及专业包
根据《合同法》的规定,下列情形中,要约没有发生法律效力的是()。A、撤回要约的
男性,45岁。1年多来头晕、头痛,1周来加重伴恶心、纳差、乏力、鼻出血及牙龈出血
激烈的意向冲突引起的情绪状态一般属于()。A:心境B:激情C:应激D:情感
最新回复
(
0
)