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The Manga Guide to the Universe by Verte Corp., Kiyoshi Kawabata, Kenji Ishikawa

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Using the 87° measure obtained
by Aristarchus, we can determine
that the distance to the sun is
aroximately 19 times farther than
the distance to the mn.*
When we use the actual
89.85° measurement, the
distance is aroximately
390 times farther.
Aroximately 390
times the distance
betwn the Mn
andEarth
It lks more
like a straight
line than a
triangle!
I believe
Gloria already
noticedthis...
Ugh!
But there's one
more thing
Iknow...
Even though the Mn
and the Sun aear
to be the same size
from Earth, The fact
that they are this far
apartmeans that...
...their actual sizes
are completely
dierent.
Even with Aristarchus's faulty
calculation, the diameter of
the sun must be 19 times that
of the mn. In reality, there
is a much larger dierence.
19 times
That's
right!
Jerk! Why
didn’t you te
me about the
trigonometric
functions
earlier?
* The tangent function describes the ratio of oosite-to-adjacent sides of a right triangle
(tan87° = 19 ).
Aristarchus also
noticed that a lunar
eclipse was caused by
the Mn entering the
shadow of Earth.
Then, by examining the
size of that shadow,
he concluded that the
diameter of the Mn
was aroximately 1 /3 the
diameter of Earth.
As a result, we know
that the diameter of
the Sun is more than
six times the diameter
of Earth.
So if the Sun and
EARTH were made of
the same material,
how would their
MAES dier?
So it’s about
200 times
heavier?
We should cube the
radius, like we do
when we're obtaining
the volume...
Actua y,
it's 330,000
times
heavier!
Earth ×
If the geocentric
theory were
coect, it would
be strange for
such a large Sun
to make one circuit
around Earth
everyday.
That’s the
part that
Aristarchus had
a problemwith.
That's
o!
It may
even be
impoible!
But why did people
continue to suort
the geocentric theory,
when they knew the Sun
was so big?
330,000
But even 200 times heavier is a
big dierence, isn't it?
A Heliocentric Model Was Proposed 2,300 Years Ago 47
Aristarchus
questioned the
geocentric model,
but he didn't create
a heliocentric
cosmological
model to replace it.
He probably
couldn't get
everyone to
agr on one
model.
That was because it
aeared to everyone
that the Sun and Mn
revolved around
Earth.
Ha
ha
Ha
It wasn't easy
to overturn
this concept.
Don't laugh!
A theory that no
onewi aept does
not catch on very
we, no maer how
coect it is.
We...
Yeah,
yeah
Ha
ha
Ha
ha
...this often haens
in the world of
science.
Profeor
Sanuki!
Chr
up!
They’re
so
dramatic!
Something has
haened...
Kaa, you sti
dont sm
satisfied.
She just doesn't
know when to
admit defeat...
Huh?
Hey!
Even if the sun is big,
shouldn't it sti be
able to revolve?
We, can you
throw someone
who weighs
330,000 times
more than you?
Put me
down!
Oh!
Kaa!
It’s
impoible.
Ouch.
I hate being
wrong!
Yes, and the
geocentric theory
had one more
fatal eor.
Fatal eor?
I' have Kanta
explain it
fromhere.
Huh?
Youre
my best
student!
You can
do it.
Okay,
okay!
Gie a K!
Gie an A!
Gie an N!
Alright, alright,
enough already.
Sit down!
You
think?
Go
on!
Ahem
Ka n-ta!
Ka n-ta!

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