               Unit 3

Text
    Can you prove that the earth is round? Go ahead and try! Will you rely on your senses or will you have to draw on the opinions of experts?
        WHY DO WE BELIEVE 
     THAT THE EARTH IS ROUND?

                         George Orwell
    Somewhere or other  I think it is in the preface to saint Joan  Bernard Shaw remarks that we are more gullible and superstitious today than we were in the Middle Ages, and as an example of modern credulity he cites the widespread belief that the earth is round. The average man, says Shaw, can advance not a single reason for thinking that the earth is round. He merely swallows this theory because there is something about it that appeals to the twentieth-century mentality.
    Now, Shaw is exaggerating, but there is something in what he says, and the question is worth following up, for the sake of the light it throws on modern knowledge. Just why do we believe that the earth is round? I am not speaking of the few thousand astronomers, geographers and so forth who could give ocular proof, or have a theoretical knowledge of the proof, but of the ordinary newspaper-reading citizen, such as you or me.
    As for the Flat Earth theory, I believe I could refute it. If you stand by the seashore on a clear day, you can see the masts and funnels of invisible ships passing along the horizon. This phenomenon can only be explained by assuming that the earth's surface is curved. But it does not follow that the earth is spherical. Imagine another theory called the Oval Earth theory, which claims that the earth is shaped like an egg. What can I say against it?
    Against the Oval Earth man, the first card I can play is the analogy of the sun and moon. The Oval Earth man promptly answers that I don't know, by my own observation, that those bodies are spherical. I only know that they are round, and they may perfectly well be flat discs. I have no answer to that one. Besides, he goes on, what reason have I for thinking that the earth must be the same shape as the sun and moon? I can't answer that one either.
    My second card is the earth's shadow: When cast on the moon during eclipses, it appears to be the shadow of a round object. But how do I know, demands the Oval Earth man, that eclipses of the moon are caused by the shadow of the earth? The answer is that I don't know, but have taken this piece of information blindly from newspaper articles and science booklets.
    Defeated in the minor exchanges, I now play my queen of trumps: the opinion of the experts. The Astronomer Royal, who ought to know, tells me that the earth is round. The Oval Earth man covers the queen with his king. Have I tested the Astronomer Royal's statement, and would I even know a way of testing it? Here I bring out my ace. Yes, I do know one test. The astronomers can foretell eclipses, and this suggests that their opinions about the solar system are pretty sound. I am, to my delight, justified in accepting their say-so about the shape of the earth.
    If the Oval Earth man answers  what I believe is true  that the ancient Egyptians, who thought the sun goes round the earth, could also predict eclipses, then bang goes my ace. I have only one card left: navigation. People can sail ship round the world, and reach the places they aim at, by calculations which assume that the earth is spherical. I believe that finishes the Oval Earth man, though even then he may possibly have some kind of counter.
    It will be seen that my reasons for thinking that the earth is round are rather precarious ones. Yet this is an exceptionally elementary piece of information. On most other questions I should have to fall back on the expert much earlier, and would be less able to test his pronouncements. And much the greater part of our knowledge is at this level. It does not rest on reasoning or on experiment, but on authority. And how can it be otherwise, when the range of knowledge is so vast that the expert himself is an ignoramus as soon as he strays away from his own specialty? Most people, if asked to prove that the earth is round, would not even bother to produce the rather weak arguments I have outlined above. They would start off by saying that "everyone knows" the earth to be round, and if pressed further, would become angry. In a way Shaw is right. This is a credulous age, and the burden of knowledge which we now have to carry is partly responsible.

            New Words
    preface
n.  an introduction to a book or speech ǰ,
 
    gullible
a.  easily deceived or cheated esp. into a false belief; credulous ƭ;ŵ

    superstitious
a.  full of superstition; believing in superstitions ŵ

    credulity 
n.  a tendency to believe to readily 

    cite
vt. mention as an example; quote (a passage, book, etc.) ٳ;

    widespread
a.  found or distributed over a large area ֲ;ձ
 
    advance
vt. put or bring forward; offer 

    appeal
vi. please, attract or interest Ͷ;иȾ;

    mentality
n.  way of thinking, outlook; mental power or capacity ,˼;

    exaggerate
vt. think, speak or write of as greater than is really so; overstate ;

    sake
n.  end, purpose Ե

    geographer 
n.  a specialist in geography

    ocular
a.  of, for, by the eyes; based on what has been seen ۾;ƾӾ

    theoretical
a.  of or based on theory

    citizen
n.  ;

    refute
vt. prove (a statement) to be untrue; prove (a person) to be mistaken 

    mast
n.  a long upright pole of wood or metal for carrying flags or sails on a ship Φ
    
    funnel
n.  a metal chimney for letting out smoke from a steam engine or steamship (,ִȵ)̴

    invisible
a.  that can not be seen 

    horizon
n.  the line where the sky seems to meet the earth or sea ƽ
 
    phenomenon (pl. phenomena)
n.  

    curve
vt. bend so as to form a line that has no straight part ʹ
n.  a continuously bending line without angles 

    follow
vi. result or occur as a consequence, effect, or inference ;ó

    spherical
a.  shaped like a ball ε

    oval
n.& a. (anything which is) egg-shaped ε(), Բ()

    card
n.  ֽ

    analogy
n.  comparison of things that have a certain likeness; similarity ; 

    promptly
ad. quickly and willingly ݵ;Ѹٵ

    prompt   a.

    body  
n.  =celestial body 

    disc
n.  Բ

    cast
vt. throw or drop; cause (light or shadow) to appear (on) ,Ͷ; Ͷ

    eclipse
n.  the total or partial hiding of one celestial body by another (ѧ)ʳ

    booklet
n.  a small book, usu. with a paper cover С

    exchange
vt. give and receive (one thing in return for another) 

    trump
n.  

    royal
a.  for, belonging to, or connected with a king or queen ʼҵ; ҵ

    statement
n.  expression in words; a written or spoken declaration, esp. of a formal kind ;

    ace
n.  (ֽе)"A",˾

    foretell
vt. tell beforehand; predict Ԥ

    solar
a.   of the sun

    the solar system
    the sun and the planets which revolve round it

    justify
vt. give a good reason for; show to be just, right or reasonable ֤ģΪ绤

    say-so
n.  an authoritative pronouncement; one's unsupported assertion Ȩ֤ݵĶ

    Egyptian
n.,a. (native) of Egypt ˣ

    predict
vt. announce or tell beforehand; forecast Ԥ

    bang
ad. with a sudden loud noise; with a sudden impact 

    navigation
n.  the act or process of navigating 

    calculation
n.  the act of adding, subtracting, multiplying, or dividing to find a result 

    calculate  vt.
    calculator  n. 
  
    counter
n.  sth. of value in bargaining; a return attack, such as a blow in boxing ּۻ۵ıǮػ

    precarious
a.  insecure; depending upon mere assumption ȫģݲģס

    exceptionally 
ad. unusually

    authority
n.  power to influence; power to give orders and make others obey ȨȨ

    ignoramus
n.  an ignorant person ֪

    stray 
vi. wander away; (of thoughts or conversation) move away from the subject 룻

    specialty
n.  a special field of work or study רҵ
   
    outline
vt. indicate the main ideas or facts of
n.  a systematic listing of the important points of a subject 

    press
vt. demand or ask for continuously ߴ٣

    credulous
a.  tending to believe sth. on little evidence, arising from credulity ŵ

    burden
n.  sth. difficult to bear; load ظ

         Phrases & Expressions
  follow up
  pursue or investigate closely; take further action after (sth.) о飻ȡһж

  for the sake of 
  for the good or advantage of; for the purpose of Ϊˡ棻Ϊ

  throw/shed light on
  make clear; explain ʹףʹʣ

  and so forth
  and so on

  as for
  with regard to, concerning 
  
  may well (not)
  be very likely (not) to ȫ

  bring out 
  show; offer to the public óʹԳƳ²Ʒȣ

  aim at 
  have as one's target, objective, etc.

  fall back on
  turn to for support 

  rest on
  depend on, rely on

  stray away from
  wander from; move from ƫ

  start off
  begin; depart

  in a way
  to a certain extent; a little; somewhat ĳ̶ֳ 

         Proper Names
  Saint Joan    
  ʥŮ

  Bernard Shaw  
  

