首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The movement of the sun creates periods of________.
The movement of the sun creates periods of________.
admin
2022-11-25
54
问题
The movement of the sun creates periods of________.
W: Dr. Smith, how did early humans start to note, or record the passing of time?
M: Well, this is a long story. No one knows what time itself is. But we can notice its passing in a number of ways. In early human history, the only changes that seemed to repeat themselves evenly were the movements of objects in the sky. The most easily seen result of these movements was the difference between light and darkness.
The sun rises in the eastern sky, producing light. It moves across the sky and sinks in the west, causing darkness. The periods of light and darkness it created were the first accepted periods of time. We have named each period of light and darkness—one day.
People saw the sun rise higher in the sky during the summer than in winter. They counted the days that passed from the sun’ s highest position until it returned to that position. They counted 365 days. We now know that is the time Earth takes to move once around the sun. We call this period of time a year.
W: I am sure the moon was also very important to our ancestors.
M: Yes, of course. Early humans also developed a way to use the changing faces of the moon to tell the time.
The moon was "full" when its face was bright and round. The early humans counted the number of times the sun appeared between full moons. They learned that this number always remained the same—about 29 suns. 29 suns equaled one moon. We now know this period of time as one month.
As early humans learned to plant seeds and grow crops, they had to know when the seasons would change. So, they developed calendars. No one knows when the first calendar was developed. But it seems possible that it was based on moons, or lunar months.
The divisions of time we use today were developed in ancient Babylonia 4,000 years ago. Babylonian astronomers believed the sun moved around the Earth every 365 days. They divided the trip into twelve equal parts, or months. Each month was thirty days. Then, they divided each day into 24 equal parts, or hours. They divided each hour into sixty minutes , and each minute into 60 seconds.
Humans have used many devices to measure time. The sundial was one of the earliest and simplest. A sundial measures the movement of the sun across the sky each day. It has a stick or other object that rises above a flat surface. The stick, blocking sunlight, creates a shadow. As the sun moves, so does the shadow of the stick across the flat surface. Marks on the surface show the passing of hours, and perhaps, minutes.
W: But the sundial works well only when the sun is shining. So, what are the other ways to measure the passing of time?
M: Of course. One device is the hourglass. It uses a thin stream of falling sand to measure time. The hourglass is shaped like the number eight wide at the top and bottom, but very thin in the middle. In a true " hour" glass, it takes exactly one hour for all the sand to drop from the top to the bottom through a very small opening in the middle. When the hourglass is turned with the upside down, it begins to mark the passing of another hour.
By the 18th century, people had developed mechanical clocks and watches. And today, many of our clocks and watches are electronic.
So, we have devices to mark the passing of time. But what time is it now? Clocks in different parts of the world do not show the same time at the same time. This is because time on Earth is set by the sun’s position in the sky above.
As international communications and travel increased, it became clear that it would be necessary to establish a common time for all parts of the world.
In 1884, an international conference divided the world into 24 time areas, or zones. Each zone represents one hour. The astronomical observatory in Greenwich, England, was chosen as the starting point for the time zones. Twelve zones are west of Greenwich. Twelve are east. The time at Greenwich—as measured by the sun—is called Universal Time. For many years it was called Greenwich Mean Time.
W: That brings us to the modern time. Thanks very much, Dr. Smith.
选项
答案
The number eight
解析
转载请注明原文地址:https://kaotiyun.com/show/D40D777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Leadingdoctorstodayweighinonthedebateoverthegovernment’sroleinpromotingpublichealthbydemandingthatministersi
Whilemanyworkersarewillingtolearnnewskillsorcompletelyretraintoimprovetheirfutureemployability,fewfeeltheyar
Whilemanyworkersarewillingtolearnnewskillsorcompletelyretraintoimprovetheirfutureemployability,fewfeeltheyar
Despitehelpingtorecordevents,photoscoulddamageourmemories.Researchersfoundpeoplewhotakepictureshave【C1】________r
Despitehelpingtorecordevents,photoscoulddamageourmemories.Researchersfoundpeoplewhotakepictureshave【C1】________r
Despitehelpingtorecordevents,photoscoulddamageourmemories.Researchersfoundpeoplewhotakepictureshave【C1】________r
Themovementofthesuncreatesperiodsof________.
Themovementofthesuncreatesperiodsof________.
Thedancingskillsincludemanydelicatemovementswhichareconsidered_______.
随机试题
某项目达产第一年销售收入(含增值税)为10000万元,总固定成本与总可变成本(含增值税)均为3000万元,增值税为1453万元,税金及附加为174万元,则项目以生产能力利用率表示的盈亏平衡点为()。
背景某机关办公楼会议室需进行装饰装修,该办公室层高4.5m,吊顶高度2.6m.装饰设计要求采用轻钢龙骨双层石曹板吊顶,局部人造饰面板造型吊顶,顶棚内含有路管线。施工中对人造饰面板的内、外表面以及相应木龙骨涂覆了一级饰面型防火涂料。该办公楼共有会议
我国现行会计制度规定,资产负债表是按( )所反映的经济内容设计的。
甲为合伙企业的合伙人,乙为甲个人债务的债权人,当甲的个人财产不足以清偿乙的债务时,根据合伙企业法律制度的规定,乙可以行使的权利是()。
简述小学生学习兴趣发展的特点。
结构主义课程论的倡导者是()
用人单位自用工之日起满一年不与劳动者订立书面劳动合同的,视为用人单位与劳动者已订立无固定期限劳动合同。()
试以外币表示进出口收支推导出马歇尔—勒纳条件。
Wheremightthisconversationtakeplace?
PeoplewhospendalotoftimesurfingtheInternetaremorelikelytoshowsignsofdepression,BritishscientistssaidonWedn
最新回复
(
0
)