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
Just like the Moon in a solar eclipse, the planet Venus will impose itself for a few brief hours exactly between the Earth and t
Just like the Moon in a solar eclipse, the planet Venus will impose itself for a few brief hours exactly between the Earth and t
admin
2011-02-05
46
问题
Just like the Moon in a solar eclipse, the planet Venus will impose itself for a few brief hours exactly between the Earth and the Sun. But instead of blocking out the Sun, as the Moon does, Venus will only appear as a small black dot against the face of the Sun. This is because Venus is so much further away from us than the Moon.
The 2004 transit of Venus will be visible in its entirety from Europe, Africa and Asia. Australians can watch the first part of the transit, but it will be after sunset when Venus completes its journey across the disk of the Sun. New Zealanders will have to content themselves with webcasts, as the transit for them begins after the Sun has set.
Although less spectacular than a lunar eclipse, the transit of Venus is far more unusual. It also has particular significance for Australians because it led to the first British exploration" of the east coast, by none other than Captain James Cook.
The reason why transits of Venus are so uncommon is that Earth and Venus orbit the Sun in slightly different planes. This difference, about 3.4 degrees, combined with the fact that Earth has a slower orbit than Venus, means that the two planets align with the Sun only twice (eight years apart) every 121.5 or 105.5 years.
Safe viewing:
The Astronomical Society of Australia suggests a simple method of viewing, using a small telescope or pair of binoculars.
Use the telescope or binoculars to project the image onto a piece of white paper or card. With your back to the Sun, aim the telescope towards the paper (use the shadow of the scope as a guide). The paper should be about 20cm behind the eyepiece of the telescope. Focus the image onto the card. Venus will appear as a black spot about 1/33rd the width of the Sun, and should be easily seen.
Warning:
Never observe the Sun with the naked eye or through a telescope, camera or other optical device as this can cause almost instant blindness.
SUMMARY:
The transit of the Venus is a rare scene. It happens twice every 121.5 or 105.5 years, with an interval of【51】years between the two. There are good reasons for its rareness. First, the Venus orbits the Sun in a different【52】to the Earth’s. The difference is【53】degrees. Second, the Earth orbits【54】than the Venus, which decides that the two planets align with the Sun twice in a long period. Although the Venus transit is less spectacular than a lunar eclipse, it is more【55】, and it has particular significance to Australians, and is very much worth viewing.
选项
答案
3.4
解析
(文章第四段提到This difference,about 3.4 degrees。)
转载请注明原文地址:https://kaotiyun.com/show/fXAK777K
本试题收录于:
B类竞赛(英语专业本科专科)题库大学生英语竞赛(NECCS)分类
0
B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
相关试题推荐
WorldTrekisanairlinecompany.
Robotsareusefulinexploringspacebecausetheycanworkintheconditionswhichexistinspace.Suchrobotsusuallylooklike
ApologyMakesRightWhetherusedtorepairold,strainedrelationshipsortolaythegroundworkfornew,productiveones,th
AWorldWithoutTimeorNumberThePirahaareanisolatedAmazoniantribeofhunter-gathererswholivedeepintheBrazilian
SeguenceWhichofthefollowingcontinuestheabovesequence?
BTWFName:BomThisWayFoundationStarted:in2011byLadyGagaand【D6】_________Aim:tobuildasocietywherepeopleaccepteach
WhichisNOTcorrectaboutSouthSudanaccordingtothenewsitem?
A、VisitaclientinNewYork.B、Meetaclientattheairport.C、Reviseamarketingreport.D、Helpthemanwithareport.C
Therewasapowercutthismorning.______,Icouldn’tdoanythingwithmycomputer.
Thesebooks,whichyoucangetatanybookshop,willgiveyou______youneed.
随机试题
我国《环境噪声污染防治法》规定,在城市范围内从事生产活动确需排放偶发性强烈噪声的,必须事先向当地主管机关提出申请,经批准后方可进行。该机关是()
社会主义国家的改革,其性质应该是()
A.输血早期B.输血中期C.输血后期D.输血后1~2hE.输血后1周血管内溶血反应多发生于
四格表资料中,甲组人群的阳性数为a、阴性数为b,乙组人群的阳性数为c、阴性数为d,两组总的合计数为n,如果H0成立,则乙组人群的理论阴性数是
空间尺寸指住宅工程室内具有独立使用功能的自然间内部净空尺寸,主要包括净开间、进深和净高。()
招标控制价的编制依据有()。
一般而言,德育目标的确立主要依据()
对于被判处有期徒刑或者拘役的罪犯,如有严重疾病需要保外就医的以及怀孕或者正在哺乳自己未满一周岁婴儿的妇女,可以暂予监外执行的,由罪犯犯罪行为地的公安机关执行。()
《天朝田亩制度》和《资政新篇》的共同的局限性在于():①对当时社会矛盾的认识是不现实的②带有强烈的小农意识③没有学习西方的政治制度④缺乏实现的社会环境
2009年10月,甲被某市第一高中聘为会计。甲根据校长办公会的安排,将学校收取的学杂费存人以甲的名义开设的银行账户。2014年5月,校长乙虚构因公借款理由,指示甲从该账户中提取15万元现金。乙将这笔钱借给弟弟开茶楼。2014年12月,乙归还了15万元现金,
最新回复
(
0
)