Comparing it with how the old Moon looks from here will tell you about the shape of the Earth and the arrangement of the Sun and Moon.
(the old Moon; looks; from here) (Comparing it with how the old Moon looks from here; will tell; you; about the shape of the Earth and the arrangement of the Sun and Moon)
the old Moon Comparing it with how the old Moon looks from here
looks will tell
from here
you about the shape of the Earth and the arrangement of the Sun and Moon