The Manga Guide to the Universe

40 Chapter 1 Is Earth the Center ofthe Universe?

A Heliocentric Model Was Proposed 2,300 Years Ago

The Grk scholar Aristarchus,

whowas born in the third century BC

(the era after Aristole), first tried to

explain the universe with a geocentric

th eo ry.

Aristarchus (about 310–230 BC)

Ancient Grk astronomer and

mathematician

However, as he continued

to make observations,

this theory smed to

have one problem...

He noticed that the

waxing and waning of

the Mn oued

because of the angle of

the light from the Sun.

What do

you mean?

Like this!!!

Stop it!

For example, when

there is a half mn,

the Sun is shining

from a location that

is aroximatel