首页
登录
职称英语
Just like the Moon in a solar eclipse, the planet Venus will impose itself f
Just like the Moon in a solar eclipse, the planet Venus will impose itself f
游客
2023-10-16
17
管理
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. [br]
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://tihaiku.com/zcyy/3103154.html
相关试题推荐
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’s
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’s
Ifyouwereonadistantplanet,andifyouhadinstrumentsthatcouldtell
Ifyouwereonadistantplanet,andifyouhadinstrumentsthatcouldtell
Ifyouwereonadistantplanet,andifyouhadinstrumentsthatcouldtell
Ifartseekstodivorceitselffrommeaningfulandassociativeimages,ifit
Ifartseekstodivorceitselffrommeaningfulandassociativeimages,ifit
Mercury,theplanetnearestthesun,isdifficulttoobservefromtheEarth
Mercury,theplanetnearestthesun,isdifficulttoobservefromtheEarth
Mercury,theplanetnearestthesun,isdifficulttoobservefromtheEarth
随机试题
Crimehasitsowncycles,amagazinereportedsomeyearsago.Policerecords
[originaltext]Neuroscientistshavelongobservedthatlearningalanguagep
Incourseoftime,oldcustoms,conventionsandobservances______(有被忽略的趋势).ten
投标人应重点注意招标文件中的以下几个方面的问题()。A、投标人须知 B、合
下列对体位的描述,错误的是A.仰卧位时,踝背屈90°可防止足下垂 B.仰卧位主
在考评者培训的主要内容中,进行( )是实现绩效管理中程序公平的前提。A.绩效反
《宋建隆重详定刑统》的篇目数是()。A.6篇 B.7篇 C.12篇 D.
阿特金森的期望价值理论认为个体的成就动机强度由()、()、(
农村信用社开展农户小额信用贷款,要在对农户进行信用等级评定后核定相应等级的信用贷
审核公式由()和()组成。A:关系公式B:计算公式C:提示信息D:舍位平衡
最新回复
(
0
)